According to the release notes, there is this new option:
Added the option 'Close forms dialog after print?' to User Preferences. Deselect this option if you typically print documents to multiple destinations. For example you print a document to printer and also email it. In this case, if you are printing a range, you will need to select the 'Ask Print OK after forms print?' option and answer No to “Everything printed OK?” after printing to the first destination, and Yes after printing to the second destination.
Why couldn't you have preserved the existing functionality as an option? In version 8.1D, if you clicked No, the dialog would stay open, and if you clicked Yes, it would close. Now, it either stays open no matter what, or closes no matter what. It is illogical that it wouldn't close after clicking Yes, regardless of the option setting.
My clients get upset at these seemingly minor changes which, when processing hundreds of orders, require a major getting used to.
Steve