Image thumbnails are now layered on a white rectangle background instead of just being the thumbnail. This has the side effect of making IQDB or similar searches with the thumbnails not working.

Why was this changed? Can we get it changed back?

I would like to support this point about the thumbnails. It's not so bad with images with resolutions that almost fit the thumbnail size but the effect is staggering with horizontally/vertically long images. IQDB and Shuu's similar search still work to some extent but sometimes the image is so distorted that it won't pick up on Shuu's version.