hang on I'm getting to the bottom of it, if I enter the bank via the DNForum Store I get:
Current DNF$ Total: 144
Current Bank DNF$: 0
Enter the Bank
Next Bank Interest: You have no vbBux in the Bank yet.
but if I click on the check link next to where it shows my DNF in the upper right hand side of every page I see:
Checking: 144 DNF$ | Savings: 3,650 DNF$