Hi
We´ve had the same problem but we have "solved" it. It is related to 2 services, "TP AutoConnect service" and "TP VC GateWay Service"
These maps local printers (connected from usb) on a laptop/ordinary client. These services remaps the default printer to the local printer, and if no local printer exists it remaps it to a "vdi local" printer (such as Pdf Writer or similar) and in last case it remaps it to a network printer (randomly)
Disable those services and your Default Printer will work like 99% of the time.
However, your users can´t use locally connected printers from their laptop and have ThinPrint connect the printer to the VDI if these services is disabled.
hope it helps
it took us forever to find out a solution.
