This may be of help.
I tried all the posted solutions to this approximate problem without success. I then went into the JS folder and opened up “media-upload.js“. As this was the first time I had opened this file directly the Lion OS pops up with the following warning < “media-upload.js” is an application downloaded from the internet. Are you sure you want to open it?>
By simply opening and closing the file I was able to load images to WP without incident.
