I had a strange problem.
I create a new post X
I upload images to it, drag and drop, all is fine.
I save and publish the post.
Then I create a new post Y.
I upload images to it. 7 images.
When I view the uploaded items in the uploader window. I get another 10 images from the PREVIOUS POST X .
REsult is Y contains 7 images, PLUS the other 10 from post X .
I tried hard to clear caches, etc. Using Firfox 10 on Mac os X 10.5.8
I also had trouble with deleting images from the media library.
So I checked permissions on files, etc.
I couldn't find anything wrong.
So I tried downgrading to Firefox 9.0.1 again... and it works fine now.
It also worked fine in Safari and Chrome , but with the downgrade I've got my main production browser back up and working.
Seems to be a cache issue in Firefox.
I did not disable or reset any plugins. just changed out the browser again.
Strange that this cache issue is starting to show up more now.
I also noticed, even in Firefox 9.01 that when I looked at a post and opened the image uploader, it would usually NOT show me the (gallery 12) tab. So perhaps still a problem with the image uploader too. REfresing the browser window seemed to clear up the gallery tab issue.
Hope that helps someone else.