Our problem is a little different. We aren't trying to get Z1 and Z2 through a single receiver synced. We are trying to sync multiple Heos components and having the issue with Z1 (on the receiver) being out of sync with other Heos components.

Ex: Go to Phono on Marantz AVR, try to sync that source with other separate Heos components to get the Phono input playing on the other Heos units.

We'll be bringing one of the newer Marantz receivers into our office to do some more testing.