Worked fine last night; today, when I click on the image icon, the entire page goes gray and I can't do anything, but cancel out. No hidden or blocked pop-ups.
I just had the same problem...with Firefox...had to update my Flash plugin, and then it worked....
(This may or may not be the solution, and quite possibly have nothing to do with anything at all, could
just be my wild imagination. Your mileage may vary, and possibly be rolled back for a quicker sale.)
All my plugins are up to date; I did read elsewhere that the powers above had updated to a new edit/reply program, so there may be some fiddling to do.
I use Firefox and got an error message a number of times yesterday that my flash player was out of date. I didn't try uploading any photos before the message, but didn't have any problems loading photos after the flash player update.
Guessing the recent Firefox update added the undocumented feature of the semi-hang.
Similar to one that happened several weeks back, but instead of the uploader being in the background, it's evidently in another instance of space-time.