Had same problem with first tape cartridge I installed, which is the same one that came with my Dymo model 160. I removed the cartridge, got out my magnifying glass, and, looking at the side of the cartridge you see when it is installed in the DYMO, found the spot at which the white tape is supposed to separate from the printer cartridge ribbon. This point is about 1/2 inch below the letter “D” in the brand name DYMO on the cartridge. There was already about 1/4 inch white tape sticking out from the point where the black printer ribbon heads back into the cartridge. I managed to grab this small length of white tape and pull it out about 2 inches while preventing the black printer ribbon from moving at all. You can prevent the black tape from moving by using something that fits in the hole, like a pencil eraser, to keep the ribbon spool from moving. The ribbon spool hole is located about 1/2 inch above and to the right of the “O” in the work DYMO. I then cut off all but a quarter inch of the white tape, reinstalled the cartridge, and now have a working Dymo. Good luck. This worked for me.