I am running PM 5 build 13158 on Windows 7 64-bit.
I have experienced several crashes, first on the last release while editing the ingest page before ingesting. The I upgraded to 13158, after the upgrade I rebooted and when I started PM, PM froze and crashed. So I next rebooted then uninstalled, then rebooted and then reinstalled followed by another reboot. PM starts but I have lost the Navigator, Favorites & Tasks. These 3 windows are on a 3rd monitor.
When starting PM I see a quick frame where these windows were but then it disappears. In the view menu these are all checked, checking and un-checking them does nothing.