Hi Barbara,
This has been fixed so breadcrumbs now appear. An official version hasn't been released that includes this fix, but if you could take the latest version from the Bitbucket repository in this branch: https://bitbucket.org/covuni/moodle-theme_adaptable/branch/version-1.7.2-2018091900 and test this works, that would be great. Obviously to put on a test system first, if you have one.
Thanks,
M