In general, updating Galaxy works very smooth. But I got some strange unresolved merges after the last update (files affecting galaxy-dist/static/scripts/packed/viz) After resolving the conflicts (to the correct latest files), the visualisation component is not working anymore.
What version are you updating to? Are you using the packed scripts via a proxy server?
Symptoms: I see the list of saved visualisations, but clicking on a visualisation just returns an empty screen. Creating a new visualisation: the box to name the visualisation appears, but after filling in and proceeding, again a blank screen with just the Galaxy Bar on top.
First step is always to clear your cache. After that, what are the JavaScript errors that you're seeing? Thanks, J.