I\'ve tried 3 different code samples and they all fail.
Here\'s the code from a MSFT employee (How to show a context menu on a range), the other two samples have pr
Check to see if this type of code exists (either in your own addin or any other addin's your company uses) and if it does either comment it out or move it to the _Shutdown event of the addin.
//reset commandbars Application.CommandBars["Cell"].Reset();