I've just noticed that the course plotter doesn't take account of grav wells properly when working out how to move your ship to a hex.
Basically what seems to happen is that it takes the direct straight line course. W then SW in my case, but as this runs through a grav well it stops the ships movement short of the desired hex.
What it doesn't appear to do is what tartarus does, is that when you select a hex that you can't reach via the straight line course it then looks to see if an alternative movement path will get you there.
This is not a major problem as such, but is a bit annoying as it means you've got to resort to cumulative movement more often.
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Constantly pushing back the boundaries of Human Stupidity.