All,

I had the same problem with my GTP_USB_Lite only working on some computers. Having read this thread it seemed like the USB chipset was to blame but be careful what other devices you have also.

Using the programmer thrugh USB hubs and extenders can cause issues as it did with me. Connecting directly to the PC's USB ports worked fine. Also make sure you are using WinPic800 ver 3.55 as this (i think) is the last version to support the Lite model. New versions require you to buy the GTP USB Plus.

On another machine i also noticed intermittent problems writing the code. Sometimes it would make 100% and other times it wouldnt. Again this seemed to be down the the USB port and other devices in the way.

All in all i know find my GTP Lite a stable and very fast programmer!