I'm trying to replicate this issue but it must be something specific to the RadComboBox instance under automation since the SelectItem()
method works just fine for me. I'm also looking at the recorded steps and it seems the only difference is a recorded test first executes ToggleDropDown()
If that doesn't help can you grant us access to the application with a test we can run locally to isolate the problem? Please submit a private support ticket if there is something you don't want to share publicly.