Yes, this is not a bug!
Actually, mGalaxy (at least in v1.0) is based on a 800*600 definition grid.
The application enlarge (or shrink) by itself with other definitions...BUT the aspect is always conserved.
(the ratio is 1,333 like: 800x600, 1024x768, 1152x864, 1280x960)
This is the reason of those black border.
In future version (and if users want it!!) mGalaxy could accomodate any screen resolution, displaying more info on larger screen for instance (ex: more items in the list) and adapting the surface to the resolution instead of simply scaling.
Is using a 1280x960 resolution a kind of solution to your problem?
Cheers,