Happened to me a few minutes ago. Turned off phone for about four minutes, to see if contrast could be corrected that way. It worked, thank goodness. Anyone else notice this issue? It's the first time I've seen it. Bought my phone from a Best Buy in NYC about a month ago. Haven't gone deep in tweaking my phone since I've rooted it (aside from Apps2SD and blocking OTA updates) so I think it could happen to unrooted users.