Cloned forum/database changing bburl of one affects both - what's going on?

[SToP_GAP]

To be honest Lynne I'm totally confused now about this... When I go to options to change the bburl field, both correctly list the base URL respectively. When you change, it changes and saves on the correct forum (but breaks the other forum until you go and re-save the same field on that one).

I have checked the "options" entry of the "datastore" table for each database and the changes are reflected correctly in just the one place.

However if I change the title of a forum it changes in both places and yet the last post date on the clone remains at 1 day old (which is correct as of when I cloned the data from the main database).

I think there is something sticking in caches somewhere. To the best of my knowledge I've disabled xcache - I really don't know what else to do!