I've got a Genie ProStealth garage door, with a little Genie G3T opener I just bought from Home Depot today.
I can't seem to program the opener; I've tried with both Intellicode 1 and 2 modes, both with the same result. Here's the summary of what I'm trying:
Reset all codes on the door (Just for the sake of a fresh shart)
Hit learn button (LED starts linking as expected)
Hit button on my remote opener (LED goes solid as expected)
Hit button on my remote opener again (LED blinks more rapidly than before, I think this is expected?)
Hit button on my remote opener again, to try and open garage door (LED blinks very rapidly with low light, and door does not move)
Video of the above (This is me, not just a video I found): (Since I'm registered for less than a week, I can't post direct URL's, you'll have to "fix" the link) www[dot]youtu[dot]be/CUhwGmlOs_Y