MAME Crashing and I-Pac Problem

[BWK900]

I have an Ipac4 and it is set with the default mame settings.  I changed a few things in mame so I can match it exactly with the Ipac.  It worked extremely well for a while even when I had four people playing.
But yesterday, my friends and I were playing a game that required it to hit all the buttons.  Then, Mame just kept crashing to the desktop. 
When I try to reprogram the IPac,  all it says is device not found, but I can still play with it perfectly.
Could anyone diagnose my real problem and tell me how to fix it?
Thanks

[Thenasty]

I bet its got something do to with  CTRL, ALT, and that button in between. MAME default uses CTRL and ALT so maybe you need to use a more secure KEYBOARD keys to use. Just my 2c.

[BWK900]

yeah, i think thats my problem, but I'm not able to reprogram my IPAC.  It always says "device not found."

[AlanS17]

This is probably stupid to bring up as you're proba bly already checked, but have you tried the following page?

http://www.ultimarc.com/ipac3.html

It's how to program the ipac from the official site.

[AlanS17]

The WinIPAC utility has been hit-or-miss for me. Try the interactive method mentioned on the link above.

[sc1103]

The Ctrl+Alt+P Method is the best.  I only use winIPAC for the on-the-go flashing in MAMEWAH.  Otherwise, the interactive method that AlanS mentioned is the best way to go. 

[BWK900]

thanks, i'll try that when i pull my CP out later.

[Tiger-Heli]

My Guess is ALT-ENTER, this is P3B3 and P1B2.  In MAME, it is also used to swap between full-screen and windowed mode.

Start MAME, go to the Tab Menu - Input (General) - User Interface - and look for the Toggle Fullscreen input.  Set this to Numpad 5 or some other unlikely to be used key.