I have heard looking into your firewall/antivirus is a good thing to do from another user. Apparently not all firewalls or antivirus work well with Affinity products. I don’t know which don’t work well with Affinity but I do know that Microsoft’s, Windows Defender works with Affinity Photo on my PC. If you have a Mac I am unsure how to help because I don’t have one. I do hope this helps you get back to editing again though. I’d suggest looking into other antivirus programs that work well with editing software as a suggestion.