Hi,
A few people have had this happen. Unfortunately it's not the module but the EZ Pages code itself which is adding the chapter=0 bit. I don't know how to stop it doing that, it doesn't do it here on my test stores/servers. It may be some configuration setting or some weird way the EZ Pages code works. It's not something that the URI Mapping module has any effect on though so I can't help with this I'm afraid. You'll need to check out the EZ Page code/settings on your store.
All the best...
Conor
ceon
Bookmarks