I found this tidbit about the automatic cash disbursement.  Sounds like you need to update the general ledger account number to the bank account it's tied to.

NOTE: Automatic Adjustment to Cash - You can have the system create an automatic cash disbursement entry if you enter checks. Click Close to exit and the system opens a pop-up display asking if you wish to create an automatic cash disbursement entry. The system does not create an automatic disbursement entry if you did not assign an account number for the Regular/Vendor Bank ID.