Chrome. It's a gray screen with to arrows on either side. In the top left it shows the "Aw Snap!" logo.
Hmm, yeah, not sure, assuming you're using a recent version of Chrome. Chrome's what I use, and it works fine for me. Could you be using any extension like an ad blocker that's interfering with the game's ability to load resources? If you go to Developer Tools under More Tools in Chrome and look at the Console tab, is there any sort of error there? Other than that, not sure to try. Sorry for the inconvenience!