I am glad to have found this site. I found a fix to a problem that was bugging me for a week and tons of useful stuff.
Anyhow. I have installed PHP6.5 with phpBB. When you click on a forum, and then click in the "Jump to" window to select a different forum, this error message automatically occurs: "Sorry, you can't access this file directly...". It leaves a blank page and the URL looks like the one below.
http://www.ouaganet.com/modules.php?f=1&sid=

My forum is accessible here: http://www.ouaganet.com/modules.php?name=Forums
Thanks,
Dcasmr :? [/u]