I'll use the Simple Image Gallery Pro since two weeks. It works very well and looks really nice.
But I have a problem with the size of the pictures using Greybox. All of my pictures have the size 600 x 450 px. I've minimized them to this size by a program. But in the gallery with IE6 and IE7 not all of them will be shown with this size. Some are smaller or larger, some are correct. With firefox 2.0 all of the pictures will be shown with the same (correct) size.
From my point of view it would be very helpful if the program would have a parameter like the Image thumbnail width and height for the size of the images itself. :(