uploading of images and video's worked in 2.2.1 (in IE and FF). Then I installed 2.2.2rc2 in a new directory with the Gallery and Blog modules. Installation went fine. Blog works.
I then inserted a Gallery page and tried to upload a image and/or video. Both didn't work. Not in FF and not in IE. You see the progress bar growing to the end and then nothing. In the older version you would then see a message below saying '1 file uploaded' and the upload tab would refresh.
I checked the assets\Uploads directory but the uploaded files were not there.