Tech support has popped on to my issue posts before, to declare that my issue is not an issue, out-of-hand.
Sorry, but I simply reject what support wrote.
I tracked through the MBC, with three other inserts on that track, and, not only that, but I had four other identical tracks (minus the MBC), AND all while Constrain Delay was active. My singer tracked wonderfully and performance was perfect. At 128kb buffers. I was not Direct Monitoring.
And you were monitoring through it before as well. Now, suddenly you can’t. Obviously, something went wrong when your pc shut down. And that’s always a possibility when the proper shutdown procedure isn’t done.
I say try to restore your system, or uninstall/reinstall.