Traveller Problems

Having problems with Traveller. Have tried the ExploreOz help desk but Michelle and David are on the road and may not be able to help for a while. In Alice Springs at the moment and will be heading off down the Great Central to Laverton Thursday. Will be off the air for some time. Hope I can get some help before we leave.
Track logging worked fine up from Melbourne to Winton. Went through a lot of areas with no internet. From Winton we headed west to Boulia, Tobermorey and onto the Sturt highway above Alice.
This last lot of tracking is showing just straight lines and not following the roads on the map. Yesterday, the straight line stopped just before the Stuart Hwy above Alice. Into Alice and around the town today still nothing. Snail trail looks good. Have the tablet hooked up by wifi to a telstra dongle. Dingle works fine. Running a computer and can use the tablet ok on other apps through the dongle Worked fine on the way up and has been no problems with this setup over the last few years. Last year especially in and out of mobile coverage and all went well. Tablet doesn’t have a sim just uses the dongle. Have checked and tablet definitely hooked up to the dongle. Have turned traveller off and on and the enable tracker off and on a number of times. When it comes back on says tracking started. Any thoughts?

Below is the link for our journey so far.

http://www.exploroz.com/tracker#d=83d46986bcfb0576