Thread:Project:Support desk/Problems editing pages and logo/reply (10)/reply (2)

If your POST data simply disappears (for example, trying to upload gives you the upload page again with no error, etc) one of the common reasons is a bad $wgServer or apache rewrite rules/alias mismatch with it. It must match the host you're accessing.

For example, if you have a $wgServer set to example.com but you access your page to www.example.com, even if both are hitting the same server, and some rewrite rules or alias is redirecting between one to the other, the POST data is lost on the redirect.