Crusader Kings II v1.05d Patch

Also available via in-game autoupdater
Paradox Interactive today issued a new hotfix for Crusader Kings II, fixing an MP issue where clients would go OOS if the host had clicked around on the bookmarks or time widget at all. Also, the hostility of attached armies is now determined by the army they are attached to (check full article for details).
A playable demo can be found here.
Update: the patch is now locally mirrored (thanks: The Patches Scrolls).