Thank you for writing.
Our development environment is Windows 7 64bit and we have never observed that kind of exception before. Could you try one quick test - is it possible to show the RadDesktopAlert without an Icon, without creating new Fonts, and without subscribing to an event? Is it possible to show RadDesktopAlert
anywhere else in your code without using threading/syncing approach, and simply call the Show method:
Is it possible to show a regular form (not RadDesktopAlert, but a regular Form object) at the problematic place? The answers to these questions will lead us to what may cause the exception - Outlook related, threading or GDI issues.
I am looking forward to your reply.
the Telerik team