i have updated to 3.3 a couple of weeks ago. until today, i had no issues with uploading using the media uploader in the flash format. I have been trying to upload using firefox and Chrome and have had nothing but issues.
the media uploader opens fine, and i can drag and drop the files just fine, but when i go to insert an image to my post, the media uploader attemps to do it, then in the same pop up window, takes me back to my dashboard on the text message tab. my image does not insert into the post. I clear my cache about every 3 days, and I posted using the mapquest plug-in yesterday, with no problems.
I will try using IE 8 and see if that helps, and check for the hotfix and see if that helps.