A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
The latest thing I can do to help you and Steve to distinguish from different errors is related to this PPTools post:
http://www.pptfaq.com/FAQ00031\_Create\_an\_ADD-IN\_with\_TOOLBARS\_that\_run\_macros.htm
I'm able to create macro, save as .ppa file, load it, click on the new button and see the test. However after restart PowerPoint the crash appears again and ask me to disable the file .ppa created.
So VBA works well and it could be that the trouble is strictly connected to loading data when starting PowerPoint.