I'm trying to get this to work and not having much luck.
After going through and setting "Save Original Files" to 'Yes' I went ahead and rebuilt the image sizes and image info. The large images are still displaying wider than what's specified in the Allowed Filetypes page. All the categories are set to Use Default.
The other thing is that the Dimension is shoing as 1374 x 480 (0 x 0) and the Filesize is showing as 135.02 KB (0 Bytes).
Image processing is using GD.
The original images were imported from coppermine - though I doubt that matters at this point.