Set up a script to use llSetEnviroment on a 10,15, or around there second timer. When enviroment is applied, the entire enviroment appears overly bright for a few seconds before settling into the proper brightness. This issue is new since PBR, and happens in both the official viewer latest version, and Firestorm, both my 7.1.13 and a friend's 7.2.3. It also appears, once, when manually setting the enviroment, most notable with Midday. It appears to be an issue with loading enviroment changes.