Might try not opening Zeno Connect. I do not have experience with the GG04 or Zeno connect, but it might be behaving now like Trimble Mobile Manager and Field Maps. If you open Trimble Mobile Manager and try to connect through it Field Maps will display the GPS location not available message.
However, if I open Field Maps and connect to the receiver and then click either the Arrow icon in the top right corner of the user interface or the Ribbon that displays GPS location not available, it will connect after about 20-30 seconds. I was told that if you try to connect to TMM and then open Field Maps the two of them fight over which one is "connected".