I've tried all that stuff, before I post something on a forum I cover all the basics. Fact is there are plenty of threads out there indicating a problem with Avast and the windows 10 start menu, unfortunately they mainly all end up the same way, user gets fed up, uninstalls avast and uses something else and never encounters that problem again.
At this point some actual procedure, fix from Avast would be awesome... this uninstall/reinstall ping pong hasn't fixed anything and I haven't heard of any thread where it helped.