I just developed white spots on my DLP 73733 and am just finding out about this situation. I have had this TV for 3and a half years and just replaced the bulb last month. I have seen other people say this is when their problems began also. Not sure if bulb replacement could be the cause as most newer bulbs are much brighter than factory bulbs, but you never know. Regardless this morning I had 1 spot and now have 3 in one day.