Hy,
I only fixed the bug in function addfile_permissions_check. It's a very,very small change. Vlad knows all the details. So please report any error or bug. And make more contribution installer packages. So it will be more stable in the future.
Tolster - to catch the bug please report more detailed what you did when (press button xxx after xxx) and where (name of php-file + line number) did an error occur. Thank you.
Stefan