Yeah, hm...
It SEEMS like we can establish a few things:
1) The crash ALWAYS happens in Beta 4.6d (4.7), but
2) the crash was not especially frequent in Beta 4.5 (the current official rel)
Ergo: The crash bug has increased for this next beta :( and something done since 4.5 has made it so...
3) The crash SEEMS to be related to the CaH, but removing CaH in current WiP (Beta 4.7) won't help (anylonger)
= We might have to realize that me might never solve this bug...
And once more, to all Players and BTs:
Forget EVERYTHING that has to do with Campaign and WotR!
However, there is a workaround I figured out (for Windows only). If you press the Start key on your keyboard, it should shrink the game down to the taskbar. You can then start it up again at any time and pick up from that point. No saving is necessary.