The mysterious case of the missing index.

I've got this nightmare replicated database (using internet replication on laptops and a main server).

I've had awful trouble with the links in it. Admittedly it doesn't have full referential integrity switched on so I should expect it really.

Anyway it's got one very popular table that kept collecting duplicates. So I added a non-duplicate index to it.

Now that index has disappeared and duplicates have appeared in the offending table again.

So how did it disappear all by itself?

The design master hasn't been touched. Replication manager history log shows that it never received any incoming design changes.

Any ideas?