Why does MS Access 2007 keep restarting itself?

[WayneClements]

I have an old MS Access 2007 project and I have moved some of its procedures to VB.NET using VS 2008. I have compiled the DLL and MS Access can use it successfully.

But when I exit MS Access it restarts automatically with no database loaded, just a blank MS Access screen, with no ribbon and the status bar at the bottom says Ready.

Even if I exit from this spurious MS Access it restarts immediately and returns to this blank screen.

This only happens after I successfully instantiate and called any of my DLL functions.

[WayneClements]

This is not an answer, it is instead some further thoughts.

My VB.Net DLL has some static data. So after it is instantiated I call an Intialise function and pass it some data which it stores at global level.

Is it possible that this causes MS Access to restart?