Hi. I have recently installed a Mybb forum to my site. It is all running smoothly, and I have CHMOD'd all of the files as directed, but I still have a problem. Whenever someone tries to upload, like uploading an avatar, or as an admin, trying to upload and import a new theme, I get an error. For instance, when I try to upload a new theme, I get the error:

The following errors were encountered:

Upload failed. Please try again.Error details:
PHP returned: Missing a temporary folder. Please contact your forum administrator with this error.

I have searched around Mybb Support, and they say to contact your site hoster. The forums are here. Thank you for your time =]