sounds like the cd dvd solders just arent good enough for imports. im basing this off of just personal experience, but most of the mods ive done either would give me red screen with imports (ie utility discs and such) or it would get past the browser but never go anywhere from there, no logo or anything. Im guessing that imports are alot harder for a mod to read then backups. doesnt sound like much you can do about this, but like i said, im not necessarily right since im basing all of what i said off of personal experience.
v7 CC Pro 2.0 SLE w/ 320gb hdd & running PS2 Linux on official 40gb hdd
v0 scph-10000 with PCMCIA bb unit running PS2 Linux Beta Release
v0 scph-18000 with PCMCIA network adaptor