Delphi TOpenDialog hangs in windows 2008 when run as remote desktop application

Question

I have a Delphi 2010 exe that launches a second exe. In the second exe, there is a dialog that calls openDialog.execute. When this runs under Windows 2008 Enterprise R2 un

Answer 1

You seems to have narrowed your problem to an access issue of some kind, so the following explanation might not help you. But there seems to exist a problem with popup windows on RemoteApp and I could imagine that it could lead (at least theoretically) to a similar problem, that's why I would like to mention it: http://social.technet.microsoft.com/Forums/en-US/winserverTS/thread/0a88919f-2d72-4340-abd7-fbe0e9545f25/

Apparently the Z-order of the windows isn't always correct when using RemoteApp. In your case TOpenDialog should be a modal popup window. Due to the bug, I could imagine that TOpenDialog could appear in the background. Your main window would remain in the foreground but would be disabled as TOpenDialog is modal. Windows might then not know how to redraw a disabled window and simply draw a white box.