ok, i figured something out today, and maybe this was already known, and if it is, i guess i'm just a dumbass
i've been having this iso9660 problem for a while (about march 9th), some devs said they couldn't find the bug.
i also previously had a problem with compressed textures (ie, it couldn't find them).
what i've been doing with the cvs is this.. i use tortoisecvs, and previsously, i've been right clicking on my xbmc folder, choosing "cvs update". that's what i've always done. i would then edit some of my parameters in build.bat and run it. would compile, then i would upload it to my xbox.
like i said, been doing this for a few months now.
today, i said what the heck, i nuked my entire cvs directory, and downloaded the entire cvs tree once again. made my changes, compiled and poof, no more bugs. iso9660 works again.
i must apologize for my insistence that there's a bug. but i'm not sure if it's just the cvs not updating correctly or what.. i have no idea why a daily update would cause such a ruckus with my daily builds.
so if you're having quirky problems, try nuking your cvs folder and re-downloading the entire cvs tree, just might fix your problem that only you seem to have.
-- stokkes