I posted on a different topic thread regarding this issue, I have broken uv’s on some models. I even reuv them with UV Master but for some reason they stay broken. Heres what I did:
deleted any config files in the pixologic folder for a fresh start.
created a fresh zsphere
converted to polymesh3d
unwrapped it in UV Master
copy/pasted uv’s
clicked mrg under export checked off grp
exported/imported obj and ended up with broken uv’s
(imported into Maya 2010 with groups turned off as a single object).
UV Master eliminated a lot of prior problems but I think it just created more lol.