I use light flow just fine. I only have it set for gmail, sms, mms,missed calls and low battery though. Works perfectly and goes away after I tap the light flow notification in the pull down after getting a text or something. I never touched anything in the accessibility section so never had that annoying talkback bug.
Sevael, does your issue happen with the phone unplugged too? I noticed, by default, that light flow will use the LED anytime the phone is plugged in so I had to turn that one off myself....just a guess.
I think I'll look at light manager too just to see if I'm missing anything. Thanks ParishL31 for the idea.