(As always, this is a wiki thread, so please edit it to help make it better).
(Thanks to @EricPB)
Due to the update of learn.TTA, minor changes are required for the first two kernels of the submission file.
Which notebook(s) are you referring to?
I encountered the missing one line item (could be the first or last item) when running learn.TTA(is_test = True) from various notebooks. This is from the (replicated) Dogs Breeds notebook.
learn.TTA(is_test = True)
After updated the git pull #78, learn.TTA() is working again. Thanks @FabianHertwig