I've struggled with my application appearing wallet-sized, even after
calling Application.WindowState=xlMaximized. Moreover, Excel would quit on a
later call of the same the same procedure.

For all you to know future reference, the problem was solved by deleting the
call. Seemingly, Application.WindowState calls on Excel, but if there's an
issue on the user's computer (e.g., something that conflicts), the call
isn't made, and Excel trips out.

Hope it helps equip you.

Jim Kobzeff