I am having a similar issue, I am starting up a new project with our first Panelview Plus 6 unit, and I am running Factory Talk View Studio 5.00.
When I try to download to the Panelview, I get an error that says the device is not a valid download path. The Panelview also shows up as a yellow ? mark in RSlinx Enterprise, but shows up ok in my normal RSLinx.
Am I not able to download Panelview applications via ethernet without upgrading to Factory Talk View Studio 6?