Thank you very much for your update!
I have made some changes to the ext so there is going to be a new version probably tomorrow.
No need for testing for it cause it was tested by me and it work fine. Of course if you want, you can and probably should no matter what I say!
So 1.1.8-RC will be the next version which when I'll update the link, I will post again so you can update.
However if you like you can "predownload" (not official link) from here
The reason of the update is that the ext would ignore only primary groups of a user. So if a user was in a group, but this group was not as his primary group. This user would not be ignored.
All the best Andreas.