I just spent 3 days working on and finally finishing the animated GIF thumbnail frame-by-frame in MS-Paint for my embedded art plugin just like I did all my other plugins that I've submitted. Always 275x116 always. It took me less time to add localization support to it than it did to make the thumbnail.
So please imagine and sympathize with my rage when I discovered that the Add-Ons submission page is blocking my 275x116 standard sized animated gif thumbnail.
I noticed that the latest added plugins have the 275x116 size. No plugins have the new restricted sizes.
Was this recently done? On purpose? If so why? Also if so, can an exception be made for me? If not, why?