Re: older versionsThanks a lot for tackling the problem!
I have invested quite a bit of work in my model and would love to see perfect renderings in the end. 
One thing I forgot about this: I have observed that on my wall with several windows, each window edge seems to re-start the texture and stretch it up to the next window edge, where it is re-started again; so it might have somehting to do with the re-starting of textures after all.
Oh, and I don't know whether this belongs in a new thread, but it seems a smaller problem to me: I also found that grouping objects (nice function!) works fine, but un-grouping removes the colours and textures from the affected objects (I ended up with chrome trees that way
).On the positive side, I am very fond of the new ability to map textures on furniture. Nice job!
