when the mouse is over an image/thumbnail as the tiled gallery loads, the caption of that image is stuck in "reverse animation" mode - it scrolls in when the mouse pointer is moved away (and stays open) and disappears when the mouse is moved over the image.
Steps to reproduce:
1. load a post/page with a tiled gallery, wait until it completes loading
2. place the mouse pointer over an image in the grid
3. press F5 to reload the page and leave the mouse pointer where it is
4. when the reload is finished, move the mouse pointer
Thanks for looking