Part of picture missing, what's up?

[Apollo]

I am running ArcadeVGA card and arcade monitor, most things run fine but some games have a couple of inches missing at the bottom of the screen eg MK1 can only see fighters from the knees up ( makes that leg sweep kinda hard, lol ). I have tried adjusting the vertical size and position of the picture but that is not the problem. Also some games have a small black square at bottom right of screen about 3cm x 3cm. Any advice or ideas on any of this?
Thankyou.

[GamingGreg]

You're probably running at a resolution not supported by the card well or you're not using hardware streching when you should be.  Check the INI for that individual game.

[krick]

Make sure you've run the AVRES Utility from here...
http://www.ultimarc.com/avgainst.html

...and/or...

the ArcadeVGA M.A.M.E. Resolution Tool from here...
http://mamewah.mameworld.net/downloads.html

[Apollo]

Thanks krick you are a legend. The AVRES tool fixed all my games perfectly. Yeeha just the paint to go!!! Then pics of the finished machine!!!
Thankyou, thankyou, thankyou.