I have really spent a lot of time to free up as much memory as i can,
With all my roms, (from~2005) i don't have any freeze with xboyadvance now,
but be sure to use these new skins
http://www.megaupload.com/fr/?d=HK77GOZQ
a simple test, try your roms with the default skin before judging the dynamic skins
They are all working with all my roms and all my systems now, there is absolutely no reason to have some bugs caused by my skins now. The only emu wich gave me some problems was neogenesis, and xboyadvance.
Now all is looking ok, don't put more than 15 banners in your sprites folder