First of all, I can definitely say that the plugin "image caption" works in WP 3.3.1.
However, there's a (not so) slight inconvenience: the caption only appears under images in which height and width have been defined, as you can see here: http://www.llueveensevilla.indiopole.com/2012/03/02/miguel-angel-iglesias/
I'm using bash 1.0 theme, and in the css all the images are re-scaled to fit the entry width (max-width: 100%;) so basically I only have to copy and paste the picasa links.
Now, if I want this plugin to work, I have to write down the re-scaled height and width and include these parameters in the img src tag. A royal pain, if you ask me.
Is there any way to modify your image-caption.php to avoid this?
Thanks a lot in advance