MyBB help.

[MattR]

Yes, in the documentation it says to set admin to 777 and files inside to 666

Where does it say that??

This is what's in the 1.4.9 package:

CHMOD the following files to 666 (ie, make sure that PHP can write to them).
./inc/settings.php
./inc/config.php (you must rename config.default.php to config.php first)
./inc/languages/*your_language*/*all files* (optional)
./inc/languages/*your_language*/admin/*all files* (optional)

CHMOD the following folders to 777 (ie, make sure that PHP can write to and execute from them).
./cache/
./cache/themes/
./uploads/
./uploads/avatars/
./admin/backups/ (optional)

You don't need to do anything to the admin folder itself, and the only files to CHMOD are the language files.