Hello all, I too am experiencing intermittent mixer history here on Cubase 9.5.1 on Win 7 64 Ultimate. Extremely frustrating especially since it has been integrated into my workflow since its implementation. Steinberg please release a fix asap.
Steinberg It’s been more than a month now, we need you to fix this, We depend on the Mixer History function, it’s a Big work flow issue. I never heard of a Logic or Protools Mixer History bug, This is not like Steinberg to ignore it. I’ve been using Cubase since 1995, never had such a serious Bug as this one. You must address this ASAP. We trust you to do So …I hate to think it will be ignored, I regard the History function as one of the biggest achievements Cubase ever had, it was my dream come true and it actually changed the way i work and affected my life, and now it’s gone 
Still not fixed!
This bug is really annoying. The mixer history was “the killer feature” when it was introduced with V9.
It prevents me from using 9.5. Because this bug shows me how unreliable this new version is.
Sorry.
I disappointed. My trust in reliability of this software is falling.
The issue is known and reproducible. It is currently set to be fixed with the next maintenance update. It might take some weeks for it to be released though…
I just had this happen to me in a large project, and all I can really say is… what a drag. I consider this feature and a few others a major function within CB that should never have an issue/bug period. I believe there are functions in a DAW that should always be prioritized and extensively checked upon, specially prior to a major upgrade release.
At least it’s being taken care of and I’m ok with that.
Any word yet on when the maintenance patch that fixes this will be released? Pretty big issue to not get patched quickly…
It should be in the first half of March but there is no exact date available yet.
Thanks for the quick response, hope it’s sooner than later.
Me too. 28 of July, still waiting for a fix…
This was fixed with 9.5.20: (2018-03-08)
CAN-12608 MixConsole
An issue has been resolved where the MixConsole History stopped logging actions.
Or do you think it is still buggy?
I don’t have this problem anymore.