Twice now I've clicked on the MP Keep and it has taken me to the SP campaign map. Haven't been paying enough attention to remember what has led up to this. In both cases I went back to MP screen, clicked on the keep and successfully made it to the MP Keep so it's really not a big deal at all. But thought I'd report it anyway.
I don't recall it being slow. Like I said, the bug doesn't really bother me but if it's indicative of a bigger issue thought it was worth reporting.
Just happened again, sequence of events: I left CH running on MP screen but put computer to sleep. Returned and clicked CAMPAIGN button -> was given the "Connection Lost" popup and was taken back to log in screen (this was expected). Logged in and when prompted chose MULTIPLAYER Clicked on MULTIPLAYER KEEP, page shows loading circle and then... takes me to the CAMPAIGN map. I vaguely recall at least one other occurrence of this bug happening right after logging in, but I don't know if it has always been immediately following a log in.