[Cannot communicate with other Affinity apps since 2.2.0 update]

Adding to the chorus here-- same error, this is beyond frustrating.
I've tried:

• Making firewall exceptions for Affinity 2
• Rebooting my computer
• Reinstalling 2.3.0 from EXE and MSIX
• Reinstalling older versions (2.1.1 from MSIX is the only one that works)

Really annoyingly, when I try to access 2 nearly completed files in 2.1.1, I get a message claiming I've used functions only available in more recent Affinity versions (which of course isn't possible).