From what I can tell after a hard time of trial&error:
Toolz RC2, RC3 work absolutely fine for L4D2 under Linux.
Toolz 1.0.0.9f works absolutely fine for L4D1 under windows. My problems were caused by either perks or pillsaddiction. I dont´wanna search any more because the server is running fine now without these 2 plugins. The logfiles from toolz I posted were the result of an enforced server restart which was caused by 1 of these 2 plugins or my customized superversus. Then it restarted and l4dtoolz generated a new logfile, no bug, a feature. I also discontinued usage of left4downtown/l4d2scores.