Yeah, I had the same problem. Only few letters I could read. You should re-upload the fonts to your mobile. They are located in "tpa/preset/system/fonts". The original files are Sans-Serif_Europe_Reg.ttf" and "Sans-Serif_Europe_Bd.ttf". If this doesn't solve the problem, try adding the .bin files (arabic.bin, cyrilic.bin ...) to the Zbin folder.