[cvsnt] Import Question

[MM]

Import does not seem to be working as I expected.

A while back, I imported a source distribution:

cvs import -m "Initial import" Project/Source Vendor Release1

It seemed to work just fine. We've modified several of the files since 
then on the Vendor branch. Now we've received a new release and I want to 
import it but keep our changes. Based on the manual, I tried:

cvs import -m "New release" Project/Source Vendor Release2

I expected it to flag conflicts on the files we've updated but instead it 
just adds the new file as another revision and ignores our changes. That 
is, if the file we changed was at 1.1.1.4, it simply adds a 1.1.1.5 that 
is the file from the new release without our changes and without flagging 
a conflict. For files that are unchanged, it leaves the revision 
unchanged and just adds the Release2 tag,as I expected.

Is something not right here or have I misunderstood how it works?

I'm using CVSNT 2.0.58d on a WinXP Pro/SP2 box and Wincvs for a client.

Any pointers will be greatly appreciated...