Ok, so this is for Dragon Commander?
If sorting by 'Date and Time' doesn't list the error at or near the top (most recent), it is likely no entry is being recorded, with the entire system locking up. In the right pane there should be a Find function, though (or use Ctrl-F), which you can use to search for DCApp.
Try lowering the game resolution and graphics settings, and switch to windowed mode, to see if that makes a difference.
You can try a multiplayer game against AI, and see if clicking End Turn freezes there, as well. If you try without making any moves, you should get a warning message come up the first time you click the button
