I've found that after installing the Anniversary update, occasionally the start menu won't open on the first click, but it will open on the second every time. YMMV.
My guess is that they included some code to reset the start menu state each time it is clicked. This normally should be happening automatically, but at least it is getting triggered manually now.
Yes, they seem to have included some way for it to recover. After this recovery launching any UWP app immediately quits too, and the notification center automatically discards all notifications. (a very bad failure-state in my opinion)
However I am still experiencing times when I have to restart explorer manually or log out/in to access the start menu or jump lists on pinned applications.
There are very few things that actually seem
improved in Windows 10 from my point of view.
The new virtual desktop feature is nice, but it's very bare-bones compared to something like OSX's Spaces feature.
DirectX 12 support is the main reason that I upgraded, but so far there's yet to be anything which really takes advantage of it.
Eventually there will be features like HDR video playback that require Windows 10 though.
But right now I'm just experiencing a lot of compatibility issues with old apps/games, and basic OS functionality seems to be quite unreliable. A poor state of affairs.
Everything about Windows 10 from Microsoft seems to be one step forwards, two steps back.
I'm sure they'll eventually get things under control, but I'd rather be back on Windows 8.1 right now.