The CSS may need to be updated for the 6.4.1 update?
The dropdown accordion menu arrows aren't being positioned it seems, the update made them disappear.
You can just follow the menu links part to replicate it in the OFF CANVAS tutorial from my signature.

Hi Alter,

Did you open up a support ticket for this. If not please do so.

Nope, didn't Steve.
I usually post them here and let Scott deal with the reports as he sees fit.
I'm assuming he's just off on vaca' for a bit... not a big issue anyway just letting them know.

Also with the update changing the OFF CANVAS pane width is creating some issues inside RSD. The pane when changed from the default 250px width covers the work panel in RSD now.

I would not count on that any more Alter. Please submit a support ticket to report any issues.