While scrolling an email in Gmail using the latest Nightly build (Built from http://hg.mozilla.org/mozilla-central/rev/895f66c4eada), I've started seeing some graphical weirdness where it almost looks like my desktop background is bleeding through to the browser. Graphics card is a GeForce 570 GTX, latest WHQL drivers, HA enabled, DW enabled, etc. Not sure if related, but I've also started seeing tabs (pinned and normal) turn transparent. See attachment for screenshot of what I'm seeing in Gmail, I can open a 2nd bug for the tabs if I need to.