I have just attempted to use FTR to make my users read an important topic. The topic is in a private forum. I find that, if I activate the mod with that topic set as FTR, then the topic becomes unavailable because anyone trying to read it is logged out. Even if they relog in, FTR redirects them to a "topic not found" page, because the topic is in a private forum.
However, if I use FTR to redirect people to a topic in a public forum, it works fine.
Any ideas?