Well, I took a look at the laser sensors last night and while the little green light was on, it wasn't very bright.
Same with me, but mine are red. They would be on, but just enough so the vibration from the door starting down would vibrate the sensor off the other sensor so slightly and quickly, the naked eye could barley catch it.
2 years in a row now this has happened when it gets cold outside for me. This after I go threw the rollers/idlers and track (adjusting and lubing) and then backing off spring tension and nothing worked. This year right after doing all this, I remembered about last year and sure enough I went down and adjusted one of the sensors and walla! It worked and I had to readjust my spring back
Good to hear it worked out for ya!