I still suspect this was due to an update in Windows 10, that is preventing the Win 10 machines communicating with the other machines (which would mean it isn't a Corona bug). For sure on not installing every daily build, but this particular one has the particular solution that you are looking for (and not very much else so it is pretty safe). Also, that's always where any fixes come first, in a daily build, as it has to be tested first to make sure it fixes things and doesn't cause any other problems.
It would be interesting to know if it resolves it - whether a case arises for their being a hotfix to Corona 2 or not would be dependent on whether this fix actually remedies that issue (mind you, if it does fix it, working with that daily build would mean not waiting for any other potential next steps).