This morning I updated to the latest and greatest version of MBS. Now I get the above mentioned exception:

2019-01-30, 13:04:29 Buffer:
2019-01-30, 13:04:29 --------------------------
2019-01-30, 13:04:29 An error happened:
2019-01-30, 13:04:29 Class/Method: WebDelegate.MouseDidMoveOverElement
2019-01-30, 13:04:29 Time: Mittwoch, 30. Januar 2019 13:04:29 43176441
2019-01-30, 13:04:29 Type of Error: UnsupportedFormatException
2019-01-30, 13:04:29 --------------------------
2019-01-30, 13:04:29 Stack:
2019-01-30, 13:04:29 
Sub Application._CallFunctionWithExceptionHandling()
2019-01-30, 13:04:29 Stack done
2019-01-30, 13:04:29 ErrorReportWindow.Constructor
2019-01-30, 13:04:35 ErrorReportWindow.Constructor done

Of course, I can just ignore the exception. But why do I get it? Code is simple:

'make nice mouse cursor to show that we are over a link

if elementInformation = Nil then Return False
if elementInformation.HasKey("WebElementLinkURL") then
  app.MouseCursor = System.Cursors.FingerPointer
else
  app.MouseCursor = System.Cursors.StandardPointer
end if
Return True

No error message with UnsupportedFormatException?
I don't have many UnsupportedFormatException raised in my plugin code.

And do you know which line it is?

The debugger sort of goes into limbo. As soon as the MouseOver happens Xojo becomes active but doesn't drop into the debugger. So I can't see anything. I added an "#if debugbuild then return" and the exception still happens.

Sorry for this. Fixed for next version.

Thank you for reporting. I sent you a link for new plugins to try.

Great. Will report back.

Thanks. Seems back to working now.