I managed to get it to install from the App store, and it's working now!
Thanks for looking into it. I'm running an unofficial release. I upgraded to the latest available, but that didn't make a difference; nor did re-installing the app and plugin. I've been installing from Fdroid. When I tried installing from the App store I got an error: "Conflicting package exists". Would it make a difference which repo I use?
Sure. Looks like the trouble starts at 21:00:19.073, when it can't find "com.ghostsq.commander.smb.smb".
Can't connect to SMB: "invalid path"