Hi there,
Made the mistake of upgrading to 2017.3 and now I just cannot run unity. It constantly fails coming up with the reporting screen on startup with the result I never actually get into Unity at all. I can get it to run if I move the root folder of all my unity projects elsewhere then start unity. It then starts.
I created a brand new project which I then saved. This seemed to work except that I wanted to use .net 4.6 like I was previously. I changed that in player settings and it wanted to restart Unity. When it did however it came up with the editor issue again.(see attached).
This time it thought that the project had been saved with a pre 5.0 version, despite the fact it was saved with 2017.3. I’m assuming this is to do with the .net 4.6, though I’m not sure. Should I give up and go back to .2?