Does the server have 2 or more IP addresses?
Interesting question. Only has a single NIC at the moment, and so, one IPv4 address. I think this is a really interesting question, though, because I have a hunch that FMP/FMS may be using the IPv6 protocol as well as IPv4 to do that network "sniffing" thing it does to find available servers on the network.
On another FMS 15 server, with FMP 15 v1, the Open dialog would automatically display three instances of the same server. I eventually worked out that there was one for each of the two NIC cards as well as an IPv6 connection.
If that's happening in this scenario as well, it's plausible that a user who picks one of the servers listed in the Open dialog they could be getting into some weird connection state where the bad import behavior is occurring. Again, I haven't tried to verify this yet, mostly because of behavior like I mentioned in the original post where things don't work, then they work, then they don't work again.
It certainly "feels" like there's something going on with this, but I haven't come up with a reliable way to test it. Anyone aware of a way to control those automated servers listed in the Open dialog?