Would that bulb happen to be an OSRAM (Sylvania) one? There have been problems shown in the SmartThings labs with OSRAM bulbs failing to repeat ZigBee signals to ST devices. They are releasing a fix soon but some immediate solutions can be found here.
While debugging the issues reported here I noticed problems refreshing a SmartSense Open/Close Sensor that was routing through an OSRAM bulb. It turned out that there were a few places in some of the DTHs where the delay was still the old small value. Hitting refresh was causing the OSRAM bulb to be completely overwhelmed by the messages and nothing was getting through to the sensor. This could also cause problems with configuration resulting in devices that are not correctly setup. We have a fix for this and some of the other SmartSense and ZigBee* device type handlers that we plan to release as soon as it gets through QA (not before Monday). If anyone wants to try the updated DTHs you can self publish any of them from this PR:
I also saw an OSRAM bulb turn on all by itself when a bu…