There is a bug in moodle 3.6 when using themes based in Bootstrap 2. The new messages drawer is not displaying the features menu correctly (see https://tracker.moodle.org/browse/MDL-64419)
The bug is already fixed and also integrated to moodle master so we'll release a new Adaptable version after moodle release version 3.6.2 that is scheduled for next Monday 14th.
But if you have a sandbox site then you can download the Adaptable master and test it in 3.6.1:
Do you have any update about the new version of the Theme?