it seems that there is a big bug with the "Slice Select Tool", especially with the "Divide" option. I have a 1792 x 512px image containing 64 x 64px tiles that I want to cut out. When I use the "Divide Slice" and split 64x64 pieces horizontally and vertically with the Preview option enabled. The preview is distorted (specially if the values of are greater in pixels per slice fields at default) and persistent, even when cancelling/closing "Divide" dialog and closing the current document. The "Divide Slice" option only works if the "Preview" option is not activated.