An Unhandled exception CryptographicException occurred in OWSTIMER.EXE
I recently saw this error while patching SharePoint with a Cumulative Update. Most people will never see this. However, you are not most people. You run Visual Studio. 
Visual Studio is trying to help us out with an unhandled exception by asking about launching debug. That’s all well and good but I didn’t write the code and have no plans to change it.
Best way to work with this is to disable the JIT (Just-In-time Debugger) by following a few simple Registry Key changes: http://social.msdn.microsoft.com/Forums/en-US/vsdebug/thread/9e6cb3fb-f8fb-4c22-8608-e521e13260ff
Visual Studio Just-In-Time Debugger
An unhandled exception (‘System.Security.Cryptography.CryptographicException’) occurred in OWSTIMER.EXE [1344]
