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I use a Rocket Theme Ambrosia template with Gantry 5. I had this problem initially where I updated the Jomsocial and the navigation bar doesn't show but "error". So I had to rebuild the entire site with a brand new install for everything and everything is working and has been working until now when I upgraded JS again.
So clearly there is something JomSocial that is doing to break my menu for some reason. But this is the second time.
STEPS TO REPLICATE:
1. Just go to the website and see where in the nav bar it just reads "error"
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RESULT
EXPECTED RESULT
BROWSER
I had to roll back my production site but I created a staging environment that you can access with the same credentials but different sub domain.
Event though 3rd party it was working fine until the upgrade so there is something that Jomsocial is doing that is causing it to break as it happens before there is nothing different except the upgrade.