I can't open Capture One because of the problem with the last catalog or session that I closed. How can I tell Capture One to not load that document?
You can jump straight to the Recent Documents dialog by holding Alt/Option (on macOS) or Shift (on Windows) when clicking to open Capture One. Hold the key until the Recent Documents window appears. You can then create a new catalog, open an existing one, or do simple tasks like adjusting Preferences.