I’m afraid this post is not a solution to you problem Jason, but only an indication that you are not the only one with this problem… we are two.
I seem to have the same problem. Whenever I drop a .NET Constructor, Property or Invoke node, or when I access Labviews .NET assembly references, Labview crashes and the system catches an Unhandled win32 Exception in Labview.exe.
Reinstalling Labview 7.1 and 7.1.1 didn’t help; likewise didn’t it help to reinstall the Microsoft .NET framework.
Before I reinstalled and upgraded the .NET framework it didn’t catch the exception it just froze.
My system is more or less similar to Jason’s running Labview 7.1.1 on Win XP home SP2 now running with .NET framework 2.0b.