Hi-
This is a known-- and veeery new-- error. The Mac package manager, Homebrew, recently stopped including PyQt4 in their repository (they switched to PyQt5), so we have been trying to find the best solution but have not decided on it yet...
We might also note that uber_subject.py is a graphical interface for making an afni_proc.py command-- and actually, I think it is often easier to just go straight to making an afni_proc.py command than to wrangle with uber_subject (though, we will try to get this PyQt4 issue settled soon so that it will be back in use). There are several base examples in afni_proc.py's help, which you could copy and then adjust to your processing needs. I believe Rick's latest-and-greatest examples are #9-11b. Then for your group analysis, you can write a script to call the single afni_proc.py command for each subject, for example.
--pt
