After upgrading Unity to 5.4, the launcher regularly gets stuck on the side despite being set to hide automatically both in Appearance settings and dconf. It does hide initially as it should, but then eventually no longer does and just stays there on top, blocking that part of the app underneath it. It usually then freezes after some time, then crashes and restarts, after which the autohide again works for a while. Before the freeze it does otherwise work save for the autohiding.

This is the report generated from such a crash. I have a feeling the freezing/crashing can be triggered by scrolling the launcher contents (when it’s in the ”stuck” mode).