http://screencast.com/t/FJjlN3yw

The error message reads
'ContextMenus' could not be initialized. Details: Object reference on set to an instance of an object.

related to https://github.com/telerik/kendo-ui-core/issues/3519
workaround for rounding function is using Custom Functions http://docs.telerik.com/kendo-ui/controls/data-management/spreadsheet/custom-functions

kendo.spreadsheet.defineFunction("ROUND", function (x) {
    return Math.round(x);
}).args([
    ["x", "number"]
]);

Cell cell = new Cell() { Index = 0, Formula = "=ROUND(1.2)", Bold = true, Background = "#fef0cd", Format = "$0" };

When I load the radspreadsheet from an excel file, the foreground color is not loaded.

A workaround is to use the Kendo Spreadsheet widget directly which imports fore color: https://demos.telerik.com/kendo-ui/spreadsheet/server-side-import-export

Repro steps 
    go to https://demos.telerik.com/aspnet-ajax/spreadsheet/examples/import-export/defaultcs.aspx
    add some text with specific fore color
    save the excel file
    import the excel file

Expected: there is no change

Actual: the fore color is not imported. Also, font size changes, but see the related item for that

If you type 15 into the font size combo box and click away, a Javascript error is thrown and the font size of the selected cell does not change. If instead you type 16 and click away, the cell changes correctly. 16 is an option in the drop-down but 15 is not.

Error message:

RadSpreadsheetScripts.js:196 Uncaught TypeError: Cannot read property 'get_text' of null


The font size combo box works correctly in the Kendo spreadsheet demo (both with the current and the 2017.1.124 Kendo version ). You can also press enter to commit your typed font size in the Kendo widget, but not in RadSpreadsheet.

Steps to reproduce:
1. Open https://demos.telerik.com/aspnet-ajax/spreadsheet/examples/overview/defaultcs.aspx
2. Click inside the font -size dropdown
3. Type 15 and click outside the SpreadSheet

Result: A JavaScript error is thrown.

A workaround is using directly the Kendo Spreadsheet widget as this will allow you to use its latest version that does not manifest this issue: https://demos.telerik.com/kendo-ui/spreadsheet/server-side-import-export

Repro steps

    Go to https://demos.telerik.com/aspnet-ajax/spreadsheet/examples/import-export/defaultcs.aspx
    Go to an empty cell
    type some text
    change its font size (e.g., to 18)
    save the file
    import the file you just saved

Expected: nothing changes

Actual: (some) cells change their height and font size, not just the cell that was edited above

The default font size on the client is not saved explicitly on the Excel file, so the Excel defaults take over (11px Calibri), so upon subsequent import all cells will have that font.

Steps to repro:

    go to https://demos.telerik.com/aspnet-ajax/spreadsheet/examples/import-export/defaultcs.aspx
    export the file
    import the file

Expected: nothing changes

Actual: all cells are 11px Calibri

Bug report

Reported in ticket № 1429260

Reproduction of the problem

1. Create a date in a cell in Excel, e.g. 9/9/2019 with format type as "Date";
2. Shrink the column so that the date is displayed as hash tags ####;
3. Select the cell and copy it
4. Paste it in any Kendo UI Spreadsheet cell

Current behavior

The date is pasted as string with value of hash tags.

Expected/desired behavior

The date is pasted as a date

Notes

The e.ClipboardContent.data contains the hash tag string as value, so the issue should be somewhere in the clipboard pasting logic