I did also some quantizer1_test_encodes, but i can't confirm the trellis bug ... i used one of the latest 1.1 builds from celtic_druid (xvid.cvs.head.gcc.p4.2004.10.18.7z) with 6of9_hvs-matrix, anamporph in mkv....
here are the samples:
http://home.arcor.de/evil.bert/Xvid%20Test/
settings: single pass, q1, trellis/no trellis, gmc, vhq 4, vhq for b-frames, b-frames 3/1,5/1, qpel, glosed gov, chroma...
note: teaser.mkv is a two-pass file, targeting by 1024 kb, same settings (trellis enabled)...