Since upgrading to 2.6, I notice the following behavior when I try to insert an image into a Post:
After clicking insert, the popup box with the image selection options turns blank white but does not close. I have to click the X on the box to close it.
The image is inserted but appears to be wrapped with a text tag like [caption id="attachment_59" align="alignnone" width="300" caption="whatever"]
If I switch to Code view and back again then the caption will appear below the image.
The image appears at the top of the post rather than where the cursor was.
When I click on Edit Image the image selection box remains on top of the new dialog popup.
All of these symptoms appear in both Internet Explorer and Firefox. The only WordPress plugin I'm using is qTranslate.
I didn't have any of these problems with WordPress 2.5.1.