Bugged Shadows on Buildings during Siege Battles?

[JGeertsen]

I've been getting back into M2TW (Namely Third Age Total War, but this bug occurs in both vanilla and in TATW, so I figured it would be appropriate to post here) and I noticed that, during Siege Battles, there are very bizarre black patches randomly spread over buildings. I definitely, definitely remember not having this issue during the last time I played back in the start of last year. Pics are below. Does anyone have any idea what could be causing this? I've had the same video card since my computer was built back in like, 2011. I'm not sure how to check out the specs of my computer but I can look it up to see how and post them if needed.

The first pic is from TATW, just to show that this issue affects all of my versions of M2TW, and the second two are from vanilla. I'm on a widescreen vizio right now so I have no idea how these pics will turn out (I'm guessing the third one will be gigantic, so I apologize beforehand!), but, take a look:

[irishron]

Steam copy? If so, you're waiting for CA to fix the lighting. I think it's one of them in here.