Seriously, on one machine on my Hamachi network I was getting the amber warning icon beside items. I tried multiple ways to fix it (reinstall, stop-start service, disable, re-enable). But then I noticed that the adapter had been renamed (Windows 10 Creators Update, maybe?) to "Ethernet 3". I renamed it to "Hamachi" and it works now. So, LogMeIn staff, maybe do a very quick diagnostic at Hamachi startup that the adapter is still correctly named. The client still started, and I logged into the nework okay, but the warning icons only went away/resolved once I renamed the network adapter to "Hamachi". Wild! Annoying, too.
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