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It is well known that the media manager, fabulous as it is, has a history of quirky and difficult problems. As we moved our sites to our new server, I found another fun one.

Slowly I discovered a new (to me anyway) creature called mod_security. Our new server has it, the old one didn't. Should you find yourself similarly stumped, see if mod_security is installed. In the Joomla administrator, select Help/System Info from the menu and look in PHP Information. It will show up in the list of Loaded Modules in the apache section.

If you suspect this is your problem, you can add this line:

SecFilterPOST Off

to the .htaccess file in the Joomla top level folder. If you are still having trouble, add this line ABOVE the previous one:

SecFilterEngine Off

And if this doesn't solve your problem, your webhost may not allow the use of these options in local .htaccess files. Or you may have discovered an entirely different media manager problem!

Do a search for secfilter in the Joomla Forums (you'll need an account) or see Joomla tracker items 9774, 8548 and 8900 for more on this issue.