On a Mac mini with High Sierra, where 2023.1.1 has been running flawlessly.
Downloaded the 2023_2_0 dmg.
Stopped the running server. Quit the Indigo app. Ran the installer. It completed successfully.
After launching 2023.2, there's nothing. No main window appears.
No Indigo windows are available (all greyed out in the Windows menu).
Activity Monitor shows the Indigo app and IndigoServer are both running.
Attempt to connect to localhost:8176 (using Safari) fails. Although the server component may be running, it's not responding.