Hey guys,
I recently bought a GPUSB from a user here, whom I won't mention. I didn't get the chance to use it for about 1.5 months, and when I finally used it - Suprise, it doesn't work

It connects to GPUSB/PHD fine, I can control the LED and run other diagnostics.
However, the issue is that the GPUSB will not guide in RA(+) and Dec(-). The other two directions work fine, infact I can manually guide in that direction in PHD as well. The ST-4 port on my mount is perfectly fine, works just fine with my SSAG. I checked the outputs on the GPUSB and confirmed that it is a GPUSB-related issue.
I tried contacting the member, suggesting that the product shouldn't just stop working if I dont use it for 1.5 months! He claimed it worked fine with him, but he can't be of much help and hasn't got the time to check it and isn't taking it back.... I really dont mean to complain but now i'll have to think twice about make purchases online
So anyways my question is this - Has anyone else encountered this problem before? I've contacted shoestring to see if they can do anything, but in the mean time thought someone here might be able to shed some lights. Any help would be great, thanks alot for reading