Problem adding images to text blocks and gallery media elements

I recently posted about having trouble adding images to gallery media elements. Sometimes I am able to add images but often I am not. I choose Add Images, add them, and they don’t insert into the gallery (no images are chosen and the first five images added to the site display). I am still encountering this problem and am experiencing the same issue just trying to insert a basic image into a text block. The problem is inconsistent, not happening always but frequently.

I have upgraded to 2.2 and am experiencing the problem on more than one computer in both Chrome and Firefox with extensions turned off. Thanks for your assistance.