So I updated my n54L from 5.1 to 5.2 and here is what I've observed:   1) DSM takes longer than normal to start... If you let it sit there it'll eventually come online via the web gui. NOTE: my DSM is using static IP, not DHCP. 2) some apps would not start (uninstall and trying to redownload would result in a database upgrading error)... I had to backup the configuration and restore the same configuration via the control panel. After the configuration restore, the apps can be started. 3) S