Using Moodle 2.6.2+ (Build: 20140320)
with Essential theme 2.6.9b (Build: 2014082401) (2014082402)
and Grid Format 22.214.171.124 (2014042303)
It's a minor issue but worth fixing when got a bit of spare time. When having both Grid Format and Essential theme enabled, it doesn't work to edit the summary of the "general" topic at the top of any module, the edit button doesn't show up. If changing to a regular topic format or another theme with grid format then the edit button shows up.