I have now bought 3 vape pens and NONE of them work with my cartridges. I've never had issues before but I'm extremely ...... off and down $70. The first pen I bought was a Vision Spinner II. It worked perfectly fine and had no issues after the first 2 weeks. Then the nightmare begins... First it was issues getting the pen to charge, and that was fixed. Now when I put my cartridge in and it makes connection to the small plate the pen won't work. It will blink 3 times (red, white, and blue) when it's connected and touching but will work fine without the cartridge attached. Then I go to a different store and was sold the Vision Spinner, brand new out of the box and fully charged per instructions... SURPRISE! I still have the EXACT same issue with this pen too. Now, for the 3rd and final time.. I go to a completely different store across town and picked up a Leaf Buddi Key Box. I get home, let it charge for 4 hours and now I can't turn the damn thing off or on. It keeps blinking red 3 times and won't do anything else. I'm absolutely ...... and never had issues using my cartridges before. Any help would be greatly appreciated :'(