It's working here without issues. I did a "clean install" of SDR# 1378 yesterday, however, and it would not fire up because of some issue with the install-rtlsdr.bat file which was causing errors and didn't actually do what it's supposed to do for whatever reason. I deleted all that stuff from yesterday and did another attempt just a few moments before making this post and it installed and everything worked fine on startup. I still have the older version safely stored (meaning the last one before 1378) so I'll keep that around for archival purposes I suppose.
I have no idea where things are going with Airspy and SDR# but I do hope at some point all these petty issues between the two competitors gets worked out. I'm pretty sure I'll be getting an SDRPlay RSP in the coming weeks if possible - I had wanted an Airspy, really, but the RSP offers things that I find to be improvements over Airspy (it's not the lower price but that is a small part of it, I have to admit) so that's where I'll end up spending my money.
Either way, even if I can't use SDR# with the RSP in the near future that's fine, I still have traditional RTL sticks that should work fine with newer versions of it. SDR# isn't the only game in town for SDR software but it most certainly is one of the most capable ones because of the plugin framework and a lot of fantastic ones that have already been developed.