I'm using the blacksword oggenc2.exe with my T30, no problems at all. Works fine from Q-1 to Q7 but haven't tested Q8 or higher yet. The regular aoTuV 4.51b also works ok from Q-1 to Q7 and probably to Q10.
Try this:
http://homepage3.nifty.com/blacksword/
Just rename it to oggenc.exe and use foobar2000 to encode. Fine every time.
Maybe you guys are using super old firmware? Try 1.71 UMS.