Unable to invoke dual mode

I am unable to got dual mode to work. I have uninstalled and reinstalled TF. No change! I have tried to double click on a tab, no luck. All this seems to have happened with the latest 10.9.3 upgrade. Any suggestions? TF is installed as noted under the Finder tab.

Don’t you have disabled TotalFinder’s chrome-style tabs in TotalFinder preferences? Disabling TotalFinder tabs will disable Visor and Dual Mode as well.

That fixed it. I do not see that information any where in the instructions. Perhaps it should be added. Thank you.