We can't upload images when publishing an article on our site. We get messages such as

File Upload Errors
Mime type, image/png, not in list of allowed mime types
(Mozilla 1.3)

File Upload Errors
Mime type, image/x-png, not in list of allowed mime types
(IExplorer 6)

Same thing with gif format etc.

We have checked usersettings.php, and in the line 483 appears:

$upload->setAllowedMimeTypes(array('image/gif', 'image/jpeg', 'image/pjpeg', 'image/x-png', 'image/png'));

So... wha are we doing wrong?

Looks like you did an upgrade to 1.3.7sr2, but forgot to copy over the new usersettings.php. When updating, make sure you copy over ALL the files from the upgrade tarball. bye, Dirk

See this article too.