I'm sure I have services in most of these projects. I frequently use our agency maps and aerial imagery for my basemaps. As far as I'm aware all services are using the HTTPS protocol. I access the projects using a remote desktop connection to a PC running Windows 7.
This afternoon I was working on a project and after saving I upgraded Pro. I haven't been able to access that project or any other APRX files since. I've tried resetting my profile and restoring folders using restore points on our server, but have had no luck in re-gaining access. I get the same "saved using newer version" error mentioned by ISP_graynic.
Working with Pro via my remote desktop is not ideal and since I've been working from home I primarily use a laptop with a single user license, but I sometimes need to access projects I didn't copy over or share web layers to Portal which can only be accomplished through my secure connection so accessing my projects is really important. Luckily, at least I have not upgraded Pro on my laptop which is also running Windows 7.
Unfortunately, I can't submit a support request directly and will need to request IT admin to submit on Monday.