I downloaded a bunch of GIF icons off of your downloads page but the device didnt detect the files. I converted them to JPEGs myself, using photoshop, but that had the added effect of removing the transparent backgrounds. The device could detect and use them now, but the backgrounds are white and it looks tacky.
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Edit: I was able to fix the problem by converting them to PNGs instead. However, you should look into the GIF issue and see if anyone else is having that problem.