Among those are missing breadcrumbs - the things at the top of the page that look like this
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In Depth Bants < Announcements and News < About This Forum
In the meantime if you do need the breadcrumb menu you can use the forum default style prosilver. Fair warning, it's ugly as heck.
To use prosilver, you can follow the steps in this FAQ post and select prosilver from the dropdown.
Please do let us know if you find any more issues, and thanks so much for your patience - we all genuinely appreciate it.