The bug with IMT file saving under VISTA, which we discovered when testing the OS, turns out to be limited to the IMT. In fact I was trapping errors while a file save was happening, and then doing nothing in the except clause, which amounts to suppressing the error. Added this to the except clause:
on E: Exception do MessageDlg(E.Message, mtWarning, [mbOK], E.HelpContext);
This is not very sophisticated, because it simply recycles the error message from the OS, but in all cases I can think of it's clear enough.
