After upgrading to the latest version of TB (60.6.1) I no longer have the option to open a message in conversation available neither in the "Message" menu (it's greyed out) nor context menu (right click on the given message)(the item is not there at all). I tried to restart TB in Safe mode, reset the controls to default but none of this worked. Even in safe mode the option is not available. I've also tried to disable and enable threading but to no avail. Is there a way to get more debugging information why the option is not accessible? Thanks a lot.