Reproduction steps:
1. Open the Unity Hub
2. Change computer's user
3. Open the Unity Hub

Expected result: Unity Hub runs as usual
Actual result: Unity Hub is black

Reproducible with: 2.4.5, 3.0.0, 3.0.1, 3.1.2

Note: reproducible on macOS and Windows 10

More issues being reported here with 3.3-beta.1 when using multiple computer users: [https://unity.slack.com/archives/C7MKBJ34G/p1662560532839199]

From a second user account on Windows:

1. Installing an editor fails from the second user account, failed message doesn't elaborate why. (Logs in thread for this.)
2. The license shown and used on the second account is my Unity Pro license from my main user account - the account signed in to the Hub is new and should have no purchased licenses. I can remove the splash screen as this user.
3. Switching user on Windows and opening the Hub on the second user account results in an endless loading screen for that Hub.