Help: Dominions 3 black screen hang after updating to 3.27

[kestrel_80]

I had to switch motherboards because my USB-controller started acting up. Plus I re-installed Windows 7 Ultimate 64-bit, because the previous installation wouldn't start with the new motherboard.

Anyway, Dominions 3 3.00 runs fine, but after applying the 3.27 patch, I always get a black screen hang when I run dom3.exe that requires a hard reset to get out of. Alt-tabbing or ctrl-alt-delling doesn't do anything.

What I've tried so far:
#1 Running dom3.exe in Windows XP SP 3 compability mode. Nothing.
#2 Downgrading from nVidia GPU 280.26 drivers to 275.33. No effect.

Maybe my 3.27 patch is corrupted? I'll download it again and see if that works. After that, I'm out of ideas... I'll report back once I've tried re-applying the patch.