[GNC] OFX import, wrong base account

[brad]

I'm running my 1st OFX import since updating to 3.8 and the ofx import 
is going to the wrong base (source) account.    How do I change that??
I see this in the help
*|"GnuCash|* then opens an Account Selection dialog to select an account 
in your CoA to match to an account name in the import file. Select the 
appropriate account from the account tree and press the *OK* button. On 
subsequent import of files from the same source account, the mapped 
*|GnuCash|* account is remembered and the account selection dialog is 
not displayed."
But that doesn't help me reset it.