Just a little suggestion that may or may not be necessary (it isn't likely to be required for experts) but when you move your units around it would be helpful if the movement was a 2 step process.
By this I mean you click on where you intend to go, a green trail then travels from current hex to destination, in each hex a movement (op expenditure) digit is included. If you are happy then you click the hex again and the unit makes its move. Have this a setting so it can be turned off (saving a mouse click).
I know there is an overlay for op expenditure for each hex (in my opinion this adds too much to clutter), and I know you can have the shading turned on to show legitmate moves.
This idea would just be helpful to explain why you are getting restricted from one hex to another - helpful for newbies like me
