Helix Ultimate 2 update and Facebook feed no longer displays correctly

Hi
Since I upgraded from Helix Ultimate 1 to 2 (2.0.7) an extension which displays a Facebook feed (Shack Toolbox Pro) no longer displays correctly. Previously it worked fine whether in "debug" or "offcanvas" position, but now it does not display at all in "offcanvas" position; and in the "debug" position it displays as an open pane, rather than as a tab which can be clicked to open.
I've also asked for assistance from the extension supplier (Joomlashack) but wondered if you have any suggestions as to what change in Helix Ultimate 2 might have caused this?
(Updating the template is the only change I made recently so must have caused this problem.)
Thanks,
Steve