I have files from the How It's Made TV series in the following format and Infuse 6 Pro is not correctly setting the metadata or thumbnails even when I manually edit the metadata and search for / choose How It's Made form the results.
The filename looks fine to me based on the Metadata 101 document and the fact that the metadata search is giving it as the only suggestion makes me think it's parsing it correctly.
Even when trimming it down to simply How-It's-Made-S02E01.avi I get the same results. It recognizes it as the right show but it will not pull thumbnails or other metadata.
TVDB seems to have the right info too.