I selected the wrong bank account in AP-H, and realized as soon as I had picked it and it went back to the main screen. I was/am at the Beginning Check Number field. It will not let me go back to select a different bank account. If I close the program (including exiting and re-starting Evo) it opens at that field and will not let me go back.
 
I went to another computer to see if it would let me there and discovered the reason, as (thankfully) that one still has the non-GUI screen. While it started in the same field, it would let me back up and change but then gave me a warning that the Pro Forma Check Register had been printed for a different account. Back in Evo I found that if I went to AP-G and printed for a different checking account that would be the one selected in AP-H. Essentially, you cannot change the bank account from AP-H once you "print" the PFCR (we never actually print it when given the option in AP-H).

I was referring to using the non-Evo program, i.e. BKAPH instead of T7APH.
 
By going into "DBA" (Classic, I presume), you are running BKAPH.
 
But you can also run BKAPH (or any other "old" program) by going to UT-A. Note, however, that some old programs will no longer work if you have done all the updates (for instance, CM-A), and some functionality will be lost on others (printing Notes, for example).