Create a new form code with Stub, Check, Stub and save it.  You may need to edit the new form code 

Exactly.  The default "Standard" form code is not saved, but named form codes do save your changes (and the last form code used is remembered, by user / workstation... plus you can set up a default form code per bank code).

I see this problem all of the time.  What's the reasoning for the Standard form code not saving the printing options?  

That is a question for Sage to answer, but I suspect it is to have a consistent default.

The Standard forms can be modified via Crystal Reports, so it's not really a consistent default so to speak.  I'm just curious because I see a lot of people using the Standard forms (not just in A/P).

Not the reports... but the table data.  You can corrupt a custom form code by configuring bad printer settings (eg. print to tray 2) causing an error related to a print driver.  Standard can never have that kind of problem.

Don't use the standard form.  It does not retain any changes to settings.  Type in a different name for the form code and save with the settings you want.