I was connected to two databases--a Data Guard primary and its standby--then we performed a role switch after which I reconnected. After the reconnect, I get the following error popping up with every query (F9) in the session of the database that had been the primary but had become the standby. I could not immediately open a new session at that point but had to stick with the reconnected session.
It appears that TOAD does not detect that the reconnect was to a mounted database that had been open previously.
Cheers,
Russ