I guess it could be a Windows 10 thing. I am still running on Windows 7.
Here is a test you could try out:
1. First start the game directly from mech.exe.
2. Then press Ctrl+Shift+Esc to get to the Windows task manager.
3. select the "details" tab.
4. scroll the list to mech.exe and right click on it.
5. now select "set affinity"
6. from the list make sure only the last CPU has a check mark on it. so for example on quad core i5 you would only check CPU 3 and leave the other boxes empty.
7. after setting the affinity on task manager go back to the game and see if the artillery sreen works.
Here is a tutorial for Windows 8 on how to set the affinity from the Task manager. Unfortunately I did not find instructions for Windows 10 but I'm hoping it is similar.
http://www.eightforums.com/tutorials/24 ... s-8-a.html
P.S. You can try and play around with different CPU's selected and see if it makes any difference.