you know, the only real purpose of Morrowind Code Patch Showcase.esp is to easily catch users who don't rtfrm and e.g. load both TR_Data.esm and Tamriel_Data.esm
(I know, nobody teach us how to use mash updaters so old TR mods are loading the TR_Data.esm master...)
Jokes apart, I think this may be not related to loading list, something I noticed in my system is when Windows updates it may change default behavior/permissions or executable programs,
check you followed the usual advices (e.g.install Morrowind out of protected folders) and/or try to set/run Morrowind.exe and MGE related files as administrator, maybe your Morrowind is currently not able to update the video settings in Windows registry...