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 6, Windows 10, 512 GB SSD, 16 GB ram, i5
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.

Newsletter Signup  Newsletter        Visit TheBrain Blog   Blog       Follow us on Twitter   Twitter       Like Us on Facebook   Facebook         Watch Us on Youtube  YouTube       

TheBrain Mind Map & Mindmapping Software     Download TheBrain Mind Mapping Software