Rob Cannon

 I had a weird problem with my computer and .NET Windows forms applications.  Every time that I would select another window and then reselect the .NET application, the app would cause a NullReferenceException.

This occurred even with the simplest application (i.e. the one created from the Visual Studio wizard).  I had thought something had corrupted my .NET or Visual Studio installation. 

I was looking at uninstalling and reinstalling everything, but I decided to do some googling.  I finally came across a reference in the newsgroups that mentioned the Kensington mouse driver and I thought “Hey, I have that mouse”.  Sure enough, uninstalling the Kensington driver fixed the problem.  I am glad that I went googling for a solution as I would never have guessed that the mouse driver could be responsible for that kind of problem.

I was so thankful, I made sure to send an email to the person who posted the solution to thank him.  Now I am posting the problem and solution to make it easier for the next person to find the solution.