Version control: messages lost in Sequence diagram

[vineetgogia]

We're using version control for our model

1. Using CVS to version control
2. The lowest level packages have been controlled.
3. The models are private to the users

It all works fine till a user makes a change in 1 package and the changes are loaded by another user, the changes are reflected.

If however a user makes a change in 2 packages simultaneously, say a sequence diagram and corresponding classes. The Sequence and classes are in different packages. When any user other than the one who made the change tries to load these packages, the messages in the sequence diagrams are missing. An explicit "Get latest" has to be done to load the latest changes. Why is this so? Is there anything we might have missed

We're using 6.1.786

Thanks,
Vineet