Did you happen to start the game before version 1.06 and then continue after updating to 1.06? If so, save the game to a new save file, and load that new file. That is the workaround, although it may not work.

This was happening to me, I found a boat that I had on auto explore was "stuck" ie decidded to sit there and do nothing. Once I manually moved it I was able to make turn change. See if you have something like that going on.....

By the way that boat had PLENTY of options on where to go next and it had maybe only explored 10% of the ocean, so why did it get stuck?

This started happening after I updated to 1.06.  In one case, on the strategic map I had an auto-exploring boat that was stuck as well (kind of pointless for the map to generate a beach inside an un-escapable bay).  But even after turning off auto-explore (btw, it would be nice for a button like that to appear toggled on/off--right now I have no idea from looking at the button whether I've got it on or not), subsequent turns would sometimes hang.  There is no specific turn when it happens.  Then it also started happening in tactical combat.  I'd choose my familiar, it would run out of moves, then I'd pick another unit and nothing would happen.  Couldn't use any of its action points.  Hitting the next turn button did nothing. 

Please fix!!!