One of the ways I amuse myself when Glitch is closed is changing my avatar.
So... today I changed my shirt-dress combination and stumbled on a pairing that seems to have an issue when the "Design your avatar" window first loads. Try it and watch the area around the neckline and upper sleeve, on the arm that's farther from the viewer. It seems to flap around a bit, like my little Glitchen's heart is beating; next a piece will flap up out of the 'wearing' plane and back down; then it seems to settle down and the issue goes away.
I tried it with both Mac and PC and I see it on both platforms.
It's actually kind of amusing. If it's still happening when the next test opens, I'll see what happens in the game world...