Slitherine

When I've commanded divisions or corps I normally have artillery brigades, however, when I went to play another battle I found no artillery in my division even though I saw it should have been there. When I selected to play as the artillery brigade within the division, the game crashed. I then checked for any updates (there were non) and then made sure to run the game as administrator. I then selected an artillery brigade to play as, and the game this time did not crash. However, when I went to command a division again, there was no artillery again, and when I selected the artillery brigade individually again, it crashed again. I haven't made any changes to the game so I don't understand why this is happening. Is there any solution for this?