I received the below by email from Reckon:
This issue arises after you have exited the session in which the ABA file was created. When you log back in you will most likely be assigned to another server.
When you process an Online Bank payment, QuickBooks creates two files. The first file is the file you upload to your bank’s internet portal - the ‘ABA file’. It is a text file and can be saved to any location. The second file in xml format. This file is saved to a default location on the hard drive of the Reckon Hosted Server being used.
When you log back into Reckon Accounts Hosted, you most likely will logon to another Server and not the server where the ABA xml file was saved to. When you click on ABA File History, no ABA files are found.
If by chance you logon to the same server that the ABA files were created, then you will see the ABA files you created.
There is no workaround