I've had this a couple of times but quite by accident i found a work-around for it.
The problem occurs on the Strategy Map. It's hard to reproduce because it's only happened when ive been chopping and changing armies - either spliting an army to attack somewhere else or simply to send a few units to another province to upgrade. I was undecided which units to use and had picked up a couple then put them back and picked some others instead. I did this a couple of times then suddenly one of the units became stuck fast on the map - it would not move and i couldnt pick it up. The unit happened to be my general that i needed for the attack which was annoying. He had not moved from another province i had simply split him from the main pack and he became stuck.
After growling and swearing at it for a while I dropped the rest of the main stack on top of the general (as opposed to the other way arround) and they merged as normal and after I was able to move again ok.
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