I've just done a clean isntall of 1.5.1, porting over my plugins and theme. Everything is great excetp c2c_the_category_image, which works for the images, but doesn't give the category link; it just shows "http://www.foo.com/category/" ... it's the same without permalinks. Is this just me, and if so, what could be wrong?
Looks to be a similar problem to the one mentioned here:
http://wordpress.org/support/topic/33423
I'd contact Scott and let him know about the problem with Category Images (if he doesn't already know...).
Interestingly, it seems the same as the bug filed here: http://mosquito.wordpress.org/view.php?id=1193
I did post over at Scott's entry for the plugin, but he seems to have been MIA for a long time :(
Edit: FIXED! Thanks to your link above, I compared the two version of that plug in. Just had to change category_id to cat_ID.