And another thing, just so I can halfway justify my remark: it seems like the only people complaining about this are the pirates, not the actual devs.
My retail copy of GTA IV is unplayable with XBR.
However this thread is overloaded with bitching, complaining and useless reporting. I'm sure the XBR dev team is looking into it, it's not exactly hard to reproduce so we don't need pages and pages of reporting what doesn't work. Patience please, gentlemen.