Hi. I've encountered an issue where Unity Hub simply doesn't seem to launch. If I double-click my desktop shortcut, my cursor gets a brief loading-icon, but the Hub will not launch. The same thing happens if I go to the .exe via file browser. I've also tried uninstalling Hub - as well as all my versions of Unity, restarting my computer, deleting my Unity pro seats, and turning off Windows Defender - the only antivirus I have on this machine. I've been using the Hub since around January 2018 with no issues. This problem appeared out of nowhere this morning, after returning to work following the weekend. Two out-of-the-ordinary things might be relevant: 1. It seems I left my work PC on over the weekend. I normally switch it off, but this could have allowed Windows to install an unwanted update while I was away. However, I see a handful of Windows Defender updates over the weekend, but no system update. 2. This weekend I installed Hub on my home PC for the first time. But I don't think I linked my professional Unity account to that Hub. Other than that, there's really not much information I can provide on reproduction. My steps are simple: 1. Turn on my computer and log into my Windows account. 2. Double-click the Unity Hub desktop icon. 3. The cursor shows a loading icon for about 5 seconds, and the task manager shows a rise in CPU usage, but the program does not appear. No errors appear either, and the task is not visible in Task Manager.