Unplanned
Last Updated: 10 Sep 2026 12:47 by ADMIN
When content associated with a TOC entry is hidden, subsequent TOC page numbers may be offset by one page. In the attached sample, the issue occurs when a Group Footer containing the TOC entry is hidden and the TOC is close to spilling onto a second page.
Unplanned
Last Updated: 02 Sep 2026 11:54 by Marcos

When adding localization in CS reports in the VS designer for .NET Framework 4.6.2, the latter adds calls to the ApplyResources function when setting report item values.

After editing and saving such coded reports in SRD.NET, though, they are deserialized differently, replacing the ApplyResources function calls with hardcoded strings. This breaks localization, although the resx files remain.

Unplanned
Last Updated: 31 Aug 2026 08:33 by ADMIN
Scheduled for 2026 Q4 (Nov)
The Telerik Reporting installer adds a copy of the legacy ASP.NET WebForms Report Viewer assembly(Telerik.ReportViewer.WebForms.dll) to the Global Assembly Cache (GAC).
Unplanned
Last Updated: 18 Aug 2026 12:16 by Abhilash Reddy

I have created a report group, and in that group's header, I have added a textbox with a sorting action.

The action can be triggered, but the data does not get sorted, regardless of whether the sorting target is the report itself or the group from which the group section is created. 

Unplanned
Last Updated: 05 Aug 2026 08:22 by Markus
Created by: Markus
Comments: 0
Category: Reporting
Type: Bug Report
1

When the reports are displayed within the WPF Report Viewer, they are rendered in the XAML format, and it does not natively support SVGs.

Currently, the SVGs are always rasterized before being written to the XAML, which results in the images being blurred when zooming in the report viewer.

Unplanned
Last Updated: 30 Jul 2026 08:43 by ADMIN

Hi, While the Report Designer exports tags to the PDF (with Accessibility enabled), the tags exported are not fully compliant with PDF/UA or 508 requirements. For example, my document has several hundred pages, each with two or three data tables on them. While the tags get exported, they are only Paragraph tags, and NOT Table tags. Is there a way to designate Table Header Rows, Header Columns, and Data Cells in Telerik Reporting such that upon export to PDF they get tagged properly?


Unplanned
Last Updated: 23 Jul 2026 08:33 by Pragati

We get an incorrect “Email format is not valid” validation when sending a report to multiple recipients. We are using the wrapper/HTML5 Angular Report Viewer

Steps to Reproduce

  1. Open any report in the Telerik Report Viewer.
  2. Click Send Email.
  3. In the To field, enter multiple valid email addresses, for example:

    user1@example.com,user2@example.com

    or

    user1@example.com;user2@example.com
  4. Click Send.

Actual Result

  • The validation message "Email format is not valid." is displayed beneath the To field.
  • Despite the validation error, the email is sent successfully to all recipients.

Expected Result

  • Multiple valid email addresses should be accepted without displaying a validation error.
  • Since the email is successfully delivered, no validation message should be shown.
Unplanned
Last Updated: 01 Jun 2026 12:10 by ADMIN
Created by: Winnie
Comments: 1
Category: Reporting
Type: Bug Report
1
I am trying to use the line chart wizard; however, after selecting the data source, it seems to silently fail, as it does not display any fields, the "Next >" button is disabled, and no errors are displayed.
Unplanned
Last Updated: 19 May 2026 09:57 by Carl
When I configure a CsvDataSource through the wizard, leave "The CSV has headers" unset (generating dummy column names), then navigate back to select a different CSV file with actual headers and tick "The CSV has headers", the dummy columns from the first file persist instead of being replaced with the real headers from the new file.
Unplanned
Last Updated: 17 Apr 2026 06:48 by Haiko

React Report Viewer throws error ts(7016) on importing it in a TypeScript project:

Could not find a declaration file for module '@progress/telerik-react-report-viewer/dist/cjs/main'. 'C:/Users/dnikolov/Desktop/ReactTypesScript/my-app/node_modules/@progress/telerik-react-report-viewer/dist/cjs/main.js' implicitly has an 'any' type.
  Try `npm i --save-dev @types/progress__telerik-react-report-viewer` if it exists or add a new declaration (.d.ts) file containing `declare module '@progress/telerik-react-report-viewer/dist/cjs/main';`

Unplanned
Last Updated: 16 Apr 2026 13:30 by ADMIN

The attached report generates different PDF documents when rendered by the Standalone Designer and REST Service, both targeting the .NET Framework 4.6.2:

  • The PDFs have different sizes
  • When using the 'Read out loud' functionality of the Adobe Reader, the items are read in a different order. The order in the PDF generated by the designer is correct, and the one in the service-generated PDF is wrong.

 

Unplanned
Last Updated: 03 Apr 2026 08:15 by Khaled Salman

I have a Telerik report designed in the Standalone Report Designer. In the HTML5 Report Viewer, the report seems to be correct, but when I export the report in PDF, the word order changes.

The problem occurs in the HTMLTextBox when rendering in PDF and previewing in the Standalone Designer with both Skia and GDI+.

In the TextBox, the same text is displayed as expected.

When previewing in the HTML Report Viewer, the Arabic text seems fine.

Unplanned
Last Updated: 23 Mar 2026 09:33 by ADMIN
Created by: Andrew
Comments: 1
Category: Reporting
Type: Bug Report
0

When using A4 paper or narrow-edge leading media the Web Viewer prints everything perfectly.

When using a 60mm x 30mm label, therefore "wide-edge" leading media, the web viewer prints the label in landscape, even though the print is in portrait!

Just because the media is "landscape" surely it is the print on the media that determines the orientation?

When using the Windows System Print Dialogue this does not occur, on the using the print from the Web Viewer. This is because the Web Viewer converts it to PDF first to print (I believe). Surely, in the code you can state NOT to rotate, OR rotate it back to the correct orientation for wide edge leading media.

The label design is portrait so all the "print / pdf" code needs to do is to query this and not assume that wide edge leading media automatically prints in landscape.

Unplanned
Last Updated: 20 Mar 2026 20:50 by ADMIN
Scheduled for 2024 Q2

When using the SqlDataSource component with a stored procedure that has an IF-ELSE condition which selects a different set of columns depending on whether the condition is true or false, the returned data schema is always as if the condition is evaluated to true.

While the schema is wrong, if I manually type the fields, at runtime, they get resolved correctly but it is inconvenient.

Unplanned
Last Updated: 11 Mar 2026 15:48 by Winnie

WPF report viewer crashes when launching it the second time. The issue appears to occur only when having a trial license activated.

System.Windows.Data Error: 23 : Cannot convert '<null>' from type '<null>' to type 'System.Uri' for 'en-US' culture with default conversions; consider using Converter property of Binding. NotSupportedException:'System.NotSupportedException: UriTypeConverter cannot convert from (null).
   at System.ComponentModel.TypeConverter.GetConvertFromException(Object value)
   at System.ComponentModel.TypeConverter.ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, Object value)
   at System.UriTypeConverter.ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, Object value)
   at MS.Internal.Data.DefaultValueConverter.ConvertHelper(Object o, Type destinationType, DependencyObject targetElement, CultureInfo culture, Boolean isForward)'
Exception thrown: 'System.NullReferenceException' in Telerik.ReportViewer.Wpf.dll
Object reference not set to an instance of an object.

Unplanned
Last Updated: 10 Mar 2026 15:29 by ADMIN
Scheduled for 2026 Q2

I want to set the Table ColumnWidth to a particular value in the Properties of the Web Report Designer. There is no property ColumnWidth as in the Desktop designers, and I tried to set the Size.Width, which is available.

When I increased the Width from the Properties, in design time, there is no change in the column width, only dashed borders indicating the new size when selecting the corresponding TextBoxes. In runtime, though, the new size is respected.

The inconsistency repeats even when I open the saved report in another browser or through another application, hence this is not a caching issue.

Unplanned
Last Updated: 26 Feb 2026 14:51 by Pavel

We are using "@progress/telerik-angular-native-report-viewer": "29.26.211"

Seems options Fit to page/Fit to width are mixed

Fit to page does what Fit to width should be doing and vice versa

Unplanned
Last Updated: 23 Feb 2026 14:56 by ADMIN

Currently, the desktop viewers don't allow adding custom headers to their requests to the service.
In HTML5-based web viewers, this is possible through the AjaxPrefilter event.

Unplanned
Last Updated: 20 Feb 2026 12:55 by ADMIN
Scheduled for 2026 Q2

I use the kendovalidator before rendering the report to check the correct parameter of initial and final date.

 

However, the validation fails because additional inputs (for the "Send Email" functionality) are included in the HTML output of the viewer even though I have disabled it.

 

I believe that if the "Send Email" option is disabled the mail data panel should not be created.

Unplanned
Last Updated: 19 Feb 2026 15:33 by Scott

In the Report Book’s Edit Parameters dialog, non‑mergeable parameters only show index 0 in the dropdown, even when multiple report instances are present:

Other indexes can be applied only by manually typing the value into the combo box, but this behavior is not intuitive and makes it unclear that parameters can be assigned per instance.

1 2 3 4 5 6