Won't open with startup, decompiling sorts it out, why?

So after a fair bit of work, with me always opening holding down the shift
key to bypass the startup form -> switchboard, I try to test as a use. No
error message, just a blank Access window, with File, Window and Help (I
think) menu items.

A decompile sorts it out.

But why's this happening? The app uses Access security and the desktop
shortcut that I'm using has the mdw info in it.

Oh, and it's Access 2000, does that matter <g>

Mike