If I click the watch/unwatch links (next to a headline) nothing happens.
I can only watch/unwatch a thread by navigating to the permalink of the thread and use the watch/unwatch link (star) from the user menu in the very top. This is very cumbersome...
I found out that the links from the user menu contain my watchlist token at the very end - whereas the watch links within LiquidThreads don't have any token. Maybe this is the reason?