I have a number of projects in Cakewalk on Windows 10 which use Reaktor 6. Recently I was going through some older projects from May 2021. In each of these projects, when I tried to display the plugin window for tracks containing instances of R6, the plugin was in a blank state. In other words, instead of having the ensemble and snapshot loaded that I was using when I saved the project, Reaktor appears as it does when it is initially instantiated.
I looked back through the release notes to find that Reaktor 6 will automatically migrate from VST2 to VST3. Is it possible that that functionality might have caused the problems I am seeing?
Edit: I should note that this is something that seems to affect only older projects. I did create a project recently to see if new projects were recalling project state correctly and did not run into that problem.