Started a new game as CP under 1.05h. Playing turn based army by army. In August 1914, I activated German I Army, moved it, then went to save the turn. The game crashed on save. Restarted game, went to load last save, the save must have been corrupted, as it would not load and locked WWI.
This is similar to earlier problems I had when trying to save in same game mode after activating German I, II, and III Armies. Got the same result. Never had the problem saving after any other point.
So, my feeling is the problem has to do with either saving after the German I army is activated, or perhaps after the primary army has been activated on a front. Those are the only two common threads I can find.
Save game files are not posted, because only the August.sav file was created, the August.map was not created during the crash.