Tom, I have my bridge working well for 18 months plus (Dan installed it). I have version 2 of SMF (BTW best forum script out there IMHO).
There is only little issue (which does not affect how it works, at least for now). In the database, when a new person signs up on my site, over in the SMF database, FOUR entries/IDs get added (as opposed to only one). Thus one's SMF DB gets filled up very quickly with redundant IDs/users.
If you get a chance, look and see if this also happens in your SMF database.