Found Solution to problem quite a few people had, that by accessing /personal they would only get forwarded to the index file but not get blocked.
The solution that worked for me was simple: rename Whitelist.txt and IP_Trapped.txt to lower case.
Then change it in the same way in all places where those filenames appear, in these files:
includes/secret.php
personal/index.php
Now it works perfectly.
My host is linux, php
5.1.5
Good Coding,
Jörg