Unable to launch stable Tor browser on OS X (could not connect to control port)

Since over a week, it's been impossible for me to launch the Tor Browser. Whenever I open the application, I get the error message "Tor Launcher: Could not connect to Tor control port." In the meantime, the progress bar on the Tor Status box that pops up when opening stays without progress.

I'm using Max OSX 10.11.6, I've deleted and reinstalled Tor to make sure am with the latest version (V6.0.5), and I've checked that I have no firewall active.

I've looked at some of the other similar issues but answers mentioned what looked like coding which doesn't seem right for this, surely it should just open when being launched...? I've been using Tor without problems for almost a year, so no idea why this started all of a sudden.

Can anyone help?

Many thanks

Trac:
Username: grobin