Test Studio version 2023.1.222

Specific Test List result cannot be opened in Test Studio Results viewer. Result is displayed with message "X tests passed out of 0 executed", but no test result is available for review. HTML and XML exports of results provide full details on the test list run.

Specific tests cannot be loaded correctly in Test Studio project. 

Errors in logging says: 

Situation: Error deserializing a run result file 'C:\<pathToFile>\filename.aiiresult'.
     Outer Exception Type: ArtOfTest.Common.Serialization.XmlPersistenceException
     Message: Error deserializing object

Situation: Unable to load test 'C:\<pathToFile>\filename.tstest'
     Outer Exception Type: System.Xml.XmlException
     Message: invalid data at the root level. Row 1, position 1

Workaround, until a fix is available, is to downgrade the Test Studio version to previous version 2022.3.1318. 

1. First take the backed up project version to use after the downgrade. 
2. Open the project root folder and locate the Backup sub-folder.
3. Find the most recent folder - it is named with the last version number you used of Test Studio before the upgrade. 
4. A copy of the project in its state before the upgrade is stored in the zipped folder. 
5. Unzip the project to a folder, but don't open it before the downgrade.
6. Uninstall Test Studio.
7. Install version 2022.3.1318
8. Open the unzipped project and continue working on your project.