Hello, first of all thank you very much for this script and all the documentation about it. I found it pretty easy to set-up, it was going good but then I got an error after initial setup. Although under the errors I can still use the forum. These errors are todo with addon_whosonline, these are what it's saying ...
Warning: unlink(./shared_files/addon_whosonline_data.php) [function.unlink]: Permission denied in /home/a8057066/public_html/minibb/addon_whosonline.php on line 35 , Warning: rename(./shared_files/addon_whosonline_data.php) [function.rename]: failed to open stream: Permission denied in /home/a8057066/public_html/minibb/addon_whosonline.php on line 36 , Warning: rename(/tmp/ECmtfQ,./shared_files/addon_whosonline_data.php) [function.rename]: Permission denied in /home/a8057066/public_html/minibb/addon_whosonline.php on line 36 , Warning: chmod() [function.chmod]: Operation not permitted in /home/a8057066/public_html/minibb/addon_whosonline.php on line 39

If you guys can help I'd appriciate it very much.

I can't say exactly without debugging files, but "Permission denied" error is related to file permissions. Did you set 0777 permissions for both 'shared_files' folder and 'addon_whosonline_data.php' file?

It could be also related to the Safe Mode enabled on your server.