Thank you for testings. Your configuration seems to be optimal and you could avoid suggestions about those arguments (cache etc..). Seems that your problem lies elsewhere at this point. (if you still have it)
I am quite sure the Support will give you further help.
btw, I updated once more the file minutes ago:
a better checking with the login box, unlikely to happens because the file self-destroys once ran but if someone tries to login with the credentials of a registered users that does not have the right permissions everything stops and the file executes the self-detroying procedure.
Once again, thank you.