SimpleGrid and Gridv2 tools in Mission Planner 1.3.58 not available

I have used Mission Planner, version 1.3.37 for quite some time. Recently, I upgraded to version 1.3.58 to take advantage of the terrain following using the laser altimeter. Unfortunately, when using the updated version, I am finding that the two plugins I used the most (Auto WP -> SurveyGridv2 and Simple Grid) are no longer accessible from the flight plan menu. I can see the dlls in the plugin directory, but for some reason they are not showing in the menu.

Does the new version of Mission Planner require some sort of enable property to force the plugins to load, or is there something I need to do to make these work once again?

Thank you in advance.