Screen moves off centre when playing certain games in mame

[monkey puzzle]

This only seems to happen in games with certain screen resolutions (e.g. Bubble Bobble 256x224). When the game starts and the screen resolution changes, I seem to have lost an inch or two from the right hand side of the screen. I can sometimes fix this problem by changing the resolution of windows to 1280x768 but this is not the resolution I want to use, and it doesn't seem like a proper fix for the problem. I am using Mala as a front end.

Can anybody help please?

[Gray_Area]

IN-formation. IN-formation. IN- ....

[monkey puzzle]

IN-formation. IN-formation. IN- ....

IN what??

[Gray_Area]

Well, that could've been a call to 'get on line' and such. But in this case it was a reference to The Prisoner.