No. No switch issue this time. I followed your instructions in my quote to the tee. LV Dart won't fire at all. No warmth. I have an Ultra max and Alpha ultra, won't fire on either one. Prior to cleaning vapor production very low. I just cleaned it to see if it was breaking or clogged. After 4 attempts out of the initial 20-20-20 sesh, it pooped out on me. Did the switch reset, pullout, push in, fingernail push, etc. At this point, I firmly believe the switch is no longer an issue(although at the very beginning of this it was). I will contact TET for my RMA# and also ask if they can switch it to the four holed bottom, as mine is currently only a two hole. i believe they were able to do it for another member. I am also sending in my AVA. It's firing, but seems to be "burning" my wax. It tastes more like "hash" than the great flavor of Rainbow Kush. It's like night and day between my VB Dabbler and Dart. I have been leaning to my Dabbler for awhile and after returning to my Dart and AVA, the flavor is not where I remember at all. So, they will both go back to got reprogammed by TET. Will follow up after said reprogramming. For now, back to the Dabbler, which serves me very well. Thanks for all the input and info folks!