Rick just posted this on pinside:
All ... CGC confirmed that a dev tool (the flipper 'issue' that is used for testing the light mangement) was included in 2.0, and it shouldn't have, so something of a human error in the compile process. So, not so much a bug but a compile flag that was not turned off.
SO - do not use 2.0, and CGC is expecting to have V2.1 this afternoon or tomorrow.