I just went back and looked through my scans, and 
I'm not seeing anything particularly different 
about them other than the nifty new feature.  
Could it be something to do with the file types?  
The time when the images were posted?  Maybe it's 
a flaw in the system that creates an uneven look 
in some of the graphics?  Colors or shading that 
don't agree with the available palette?

Otherwise, all of my cel scans are perfectly 
fine, even the ones I uploaded recently.

-Chaotic Serenity