hey i have the same problem too... but I think there's some explanation to this... correct me if I'm wrong...
when I imported a black Jazz jersey to the away .fsh I couldn't find way to import the image file 'coz it was in .png... i dunno but i read somewhere that FshX can import .pngs... i tried that but i still couldn't import the .png file... i ended up saving it as a .bmp (w/c FshX supports) and imported it...
after doing thing i tested it and i found out that the numbers weren't there anymore... i remember a dialog box popping out as i saved it to .bmp that it doesn't support transparency... so... maybe this is where the problem lies?
expert patchers correct me if i'm way off!
thanks!