Forum Upload image from computer error
 

When trying to upload images from computer using the enhanced attachment uploading on I get this error;
404 [IOErrorEvent type ="ioError" bubbles=false cancelable=false eventPhase=2 text="Error #2038"]
When I switch the enhanced attachment uploading to off I can upload fine.

Safe mode in my php info is off and is also set to no in my server settings.

What else should I be looking for?