The bookmark no longer constantly refreshes; it seems to have started working.
In the Knowledge Base and the Library, after selecting a section under the filter and then going back (Alt+Left), the selected section keeps showing a spinning circle, and above the log a bar runs endlessly, trying to load or reload something, I don't know. Maybe it's just me.
Yes, I also noticed a couple of days ago that there was such a bug with the filters; it's already been fixed.