Not sure this ever got solved and it got reported by a few people.
It only happened to me when I accidentally created 2 samples with the same name and loaded them into a project but I suspect this was a coincidence.
Never had an issue with 1.52
1.52 has the updates which allows you to turn off the backlights which for me was a game changer. Perhaps you got blinded by the 1.50 light show and forgot to save 
sorry. Joking.