I discovered that there was a minor glitch with the way members were being promoted in regards to their titles and being granted extra permissions (e.g. being able to post in Shameless Commerce). As such I had to go through and rework permission groups and move people into the proper groups. I've tried to be very careful and make sure that everyone ended up where they should, however, if anyone finds they are having problems accessing a specific forum or are having problems posting, please let me know.