I have a similar issue. I changed the size of the images used by the promoblock (big pictures that rotate via javascript loader on front).

My problem is that I can't find the code to change the size allocated for the pictures. The graphics are viewing properly but there is a huge blank space above them. This means some code is defining the size of the pictures according to the ORIGINAL pictures, not the ones I put in. Where do I find this code? The general.css doesn't appear to have a vertical see more size definition for this block.