I ran the auto update on my site and everything seemed to go well, i then ran some tests and when I try to create a new topic and/or reply to an exisitng post, all I get is a blank page.

Could be a language file issue or even a more minor glitch, try to activate debug in config.php (un-comment the last two lines), if you can see an error message, then it should help to better understand the cause, if not, chances are great that this deals with language packs.

Post here the error message you get if you get any, otherwise, winmerge can help you to make sure you language packs are up to date

Must have done something wrong, I reapplied the update and everthing is working, thanks for the quick response