see Black window is drawn instead of opening the app v1.0.3
This may be n/a for most, but might help someone.
My scenario was having a very old version of obsidian installed, and possible complications with obsidian trying to automatically update itself.
The workaround for me was to disable automatic updates in settings/about, and remove the obsidian-1.5.3.asar file in %appdata%/obsidian.