It shouldn't matter what the owner.group is. FYI my installed pose is also user.root, as yours.
Check that you didn't inadvertantly set your home directory non-writable or something (start xterm, enter ls -ld) because I think it's trying to write to a .poserc file or something.. but I thought that happened a good while after it started ok.
I can't see right away what the problem is. I have it installed in /usr/local/bin/ (with the PATH accordingly), but I don't see why it shouldn't execute out of /home/user/.
Or did you install it to a directory on a card? That wouldn't work, as those filesystems are mounted noexec.