Sorry I'm still unable to reproduce the problem with that document. I'm sure it's there... I just don't see it.
I was hoping that if I could figure out why it was happening then I could suggest how to avoid... but since I don't see it... I'm not sure.
It's very unlikely that I'll be updating WriteRoom 3 again. Right now I'm full speed ahead trying to get WriteRoom 4 done. It's not there yet, but plan to put a limited preview version out soon.