Creatures stuck in the impenetrable rock.
Windows 10 64 bit, 8 Gm RAM, Intel(R) Core(TM) I7-4500 CPU1.80 GHz 2.40GHz GPU: AMD Radeon R7 M265, Intel(R) HD Graphics Family. Version game fresh, 1.5.2f4
Beast master and 2 of being stuck in the impassable rock. Please avoid such situations. For any creature, should not be able to go to the tile with impenetrable rock. The game speed is 150%. But this is no excuse for the bug.
Save: exclave _20170301175950.zip
This is due to the game speed mutator being set too high, which as you are clearly warned when using mutators can cause unexpected and unsupported issues. In this case the issue caused is that units are moving more quickly than the physics engine can handle, causing them to glitch through walls. The only way to fix that would be to cap game speed in order to prevent units reaching such speeds.
I'm a new player, and I don't know what a game speed mutator is. I had this same issue when I increased the game speed using the left-ctrl+page up hot key. All of my units ended up in a wall at 150% speed.