delete qagame.mp.i386.so and qagame_mp_x86.dll and put back the original files.. Probably named etpro_qagame.mp.i386.so and etpro_qagame_mp_x86.dll if you folowed the instructions of the tzac site
A late reply, but:
To run TZAC you always have to place the TZAC files in the fs_homepath/etpro/ directory, not in fs_basepath/etpro/, you need unique fs_homepath's for each server, because in the homepath dirs it also puts logs and stuff, and you don't want these to overwrite eachother..
So if you just set unique fs_homepath's for all your servers, you can choose to run TZAC or PB on each of them..
Don't launch the game with TZAC?
To run TZAC you always have to place the TZAC files in the fs_homepath/etpro/ directory, not in fs_basepath/etpro/, you need unique fs_homepath's for each server, because in the homepath dirs it also puts logs and stuff, and you don't want these to overwrite eachother..
So if you just set unique fs_homepath's for all your servers, you can choose to run TZAC or PB on each of them..