Turn on Preferences / Launching Opus / Explorer Replacement / Open all Default Lister tabs when opening a new window.
Crashes are usually caused by external shell extension DLLs misbehaving. See these two guides, and if you still have problems please start a fresh thread for them with details of when the crashes occur, and we can help track down the cause:
[ul][li]Crash, exit or high CPU usage when viewing certain directories[/li]
[li]Crash, exit or high CPU usage when right-clicking certain files[/li][/ul]