Xport seems to occasionally forget its settings after a resume. One of the following things happen:
- the GPS unit isn't re-detected on resume. A reboot of the computer fixes this
- the COM port in Xport gets "forgotten": I have to un-check "Enable Service", check it again, select the COM port ant tick the radio button beside it.
I have installed the latest GPS drivers as suggested on the Xport homepage. Using the GPS unit that came with MS Streets 2007 (Pharos GPS-360 I believe).