When I log into EISY-UI, I get the error message: “PG3 service returned an error Error.  Request failed with status code 500.  Continue without PG3?” After continuing, PG3 does not show up inside my menu and, perhaps not unsurprisingly, under EISY plug-ins, migrate from PG3 does not work. Any known solutions?

Had the same issue.

Try rebooting the EISY.

If that doesn’t work, try restarting the PG3 service by logging into EISY from command prompt with SSH, then use the following commands:

sudo service pg3 onestop

sudo service pg3 onestart

Thanks Nestor. Rebooting did the trick (this time), though I had previously rebooted with no effect. But that earlier reboot was done after a failed attempt to migrate, so maybe that's why it didn't work.