Broncolor power packs with an IR Receiver (identified by the small red dome on the pack which is the IR receiver itself) have a potential problem in studios with new eco-friendly room lights.
These new eco-friendly room lights put off enough IR light to trigger the pack. In other words the pack mistakes the room lights IR flicker as a signal to fire and consequently fires in a stroboscopic manner (several times per second for as long as it sees the room lights). This can be very to misdiagnose as a problematic/defective pack since they user might experience or not experience the issue based on whether the room lights are on, whether someone is standing over the pack blocking the room lights, or bring it into another room to diagnose the issue where it would not happen.
This is not really an issue for usability since almost no one uses IR transmitters for studio packs (instead using radio triggers) but if someone holds down the reset button for 10 seconds the pack resets to factory defaults which on some packs means the IR receiver will be on.