email follow up to GNATS PRs

[Elena]

Hi,

Can anyone point me to the right direction....

We have gnats 4.0 beta version. When someone sends email follow up to 
gnats, following happens:

1. file "gnatsBlah" created in the gnats-queue directory
2. Short thereafter file disappears from the the gnats-queue directory (I 
think it is getting parsed correctly than)
3. Gnats sends email confirmation "The following reply was made to PR 
.....; it has been noted by GNATS." with a body of follow up.
4. Nothing else happens

I was expecting that at #4 I would see follow up appended to the PR's 
audit-trail, but this never happens. Any ideas of what may be wrong? I have 
checked file permissions, GNATS can write to PRs. Also, audit-trail entries 
working otherwise (State change, etc)

Any help is much appreciated!
-elena