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dkeating said..
The tracks screen top RHS has 1 vertical line and 1 horizontal line going thru the centre but nothing else.
That means that your track starts with one or more points that are completely wrong. That happens when GPS units start to log before they really know where they are. Your track is (probably) showing, but since the first point(s) can be anywhere in the world, it is zoomed so far out that it's all in one pixel or a few.
To fix this, select the first few points in the trackpoints table on the left, go to the "Tracks" menu, and choose "Delete selection". If you don't the the tracks right away after that, select the "1 hour" top speed in the results table (below the tracks on the right), and zoom in. On most computers, you can use the mouse scroll wheel to zoom.