Just upgraded from RA2016 to RA2017 Contractor Edition and all went fine, so far the only problem I've encountered is not being able to save invoices as PDFs via the File/Save as PDF... menu. It presents an error screen.

I can email as a PDF - so for the time being my workaround is to "email" the invoice and when outlook opens the message window - open the attached PDF and then use Acrobat Reader DC to "save as" to the pc harddrive. Invoices print fine, and display OK using print preview. PC is running Win 7 professional.
When I open Devices and Printers "Reckon Accounts V5 PDF Converter" is selected as the default printer.