Hi Lisa:
BankRec 8.1E with the November service pack applied will give you that message. You aren't doing anything different or wrong. I encountered this recently myself. The cause is that one of the banks started to supply a non-standard OFX file (it had no end-of-line characters). Without those end-of-line characters, the Bank Reconciliation import process would fail because it found one VERY long line that exceeded 65,000 bytes. Therefore to prevent that problem, BankRec now checks the file-size.

Softrak R&D is looking for a better solution but in the meantime, you should see if your bank can provide a comma-separated file format (CSV). If so, download that file, create an import template that matches and you will be fine. You may need to ask your dealer for help with the import template.