Your documents come back after an update restart. Choosing “Restart Now” when an update was ready could forget which documents were open — if you kept two wikis side by side, only an empty launcher greeted you after the restart. The restart now snapshots your open documents before the windows close, so everything reopens exactly as you left it. (Updating to this version is the last time the old bug can bite: if you have documents arranged just so, choose “On Next Quit” for this one update.)
Thanks to the user who reported it.