On one of my Windows 10 computers, Unity Hub 1.6.0 and Unity Hub V2 beta no longer open and get into the same circular license error. This began happening since the last major Windows update (1809). When I open Unity Hub 1.6.0 it will ask for me to provide license information, and after I provide a valid serial key for my plus account it registers it, moves to a screen saying it was successful, before moving on to do 1 of 2 things: either it loops back to the license information screen again asking me to provide info all over again, or it moves to screen that just says license error at the top. In the online seat manager it registers my computer's seat, and in ProgramData/Unity it builds a license file. In the V2 beta it comes up with a slightly different error when I attempt to enter a license - it opens an error toast that says something along the lines of "machine id not recognized". I should also point out that it doesn't matter whether I attempt to enter a serial key for my plus account, or click that I'm using just using personal account. I've tried every conceivable permutation of deleting the license file, removing the seat from the online seat manager, re-building the license, restarting Unity/the computer, all to no avail. I've also completely wiped all Unity files and directories from my computer and tried again, but it didn't change anything. The "Machine ID" error makes me think it's an error with the MAC address - and in that regard my only guess is that the MAC address that gets listed in the license file is my ethernet MAC address, but my computer uses wifi (with a different MAC address) to connect to Unity servers. I've tried connecting online with ethernet to rule this out, and it didn't change anything. The only last bit of info I can give is that if I open Unity directly with 2018.3.12, I can actually get past the license screen into the project list, and actually open projects from there. This works fine except Unity doesn't recognize my plus account, and won't let build projects without a splash screen. Any help would be really appreciated.