Why is it that a PDF icon does not show in the plex (when a PDF is the only attachment in a thought) when all other icons show (e.g, Microsoft word). Adobe Acrobat is registered as a default program.  PDF thumbnails show correctly on my Win 10 desktop.
customized Desktop PC (Haswell i7 4770 3.4 gHz with 32 GB RAM), Windows 10 Pro 64-bit, 256 GB SSD,  and a Microsoft Surface Pro 4, Windows 10, 256 GB SSD, 8 GB ram, i7
This might be a corrupt registry on your system. I would recommend starting by un-installing Acrobat, restarting your machine then try to re-install it all while TheBrain is closed then try again.

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