I'm on Windows 10 and as some of you, I have problems with my Start button not working any more since 2 months ago. Searched during days for solutions online. I tried one of the work-around proposed in forums and created me a new user account. And miracle, the Start button worked again + the boot up time reduced to 33 seconds instead of 55 s, my boot-up disk being a SSD. But then if I decide to keep this new user account in place of the original one, I would have to re-install all my applications, re-create of my Desktop shorcuts, etc. So I kept my original account, and still waiting for a real stable fix-up from Microsoft.
When I had this Spotify notification I cound not open, I switched to my alternate account just to check, and discovered I could at last click on the notification to open it ! So we may wonder what's really wrong : Spotify or Windows ?
I have the same problem. I am on windows 10/Samsung, which I upgraded two weeks ago. Didn't have any problems with Spotify until i updated it last week. After that, I have not been able to get access to my notifications and inbox, although I can see that them.