I have photo galleries here : http://ville.montreal.qc.ca/portal/page?_pageid=6637,58817672&_dad=portal&_schema=PORTAL
Under IE7 and Firefox 3.6, I get problems with the height of the box clipping the navigation arrows at the bottom when displaying a very long description under the picture.
Look at the first picture of the second gallery and change your window size + navigate in the galeries a bit if you cannot reproduce the bug, you will see it eventually if it does not poke its nose right away..
Any easy css fixes one can think of, so as not to hack the plugin file?
Maybe the later would be best, as visibly, the evaluation of the height of the container is done anew for each new image to display within the plugin methods.
I nailed this bug and found simple workaround. Height of pp_content is calculated in function _getDimensions by copying hidden pp_details element offscreen and measuring its dimensions. This copy contains unstyled pp_close button (its dimensions are unspecified because theme style not yet applied). To fix this simply add this oneliner to your stylesheet (pixel size is valid at least for light_rounded theme):