MotD = /resource/ui/TextWindow.res and loads /cfg/motd(_text)_default.txt
Main Menu Update notices/blog posts is loading /cfg/motd_entries.txt
Since the last one is available with the MagnumHUD in the /cfg folder and has a url linking to the tftv thread it is overriding the one that comes default with the game.
Renaming custom and taking out files you don't need and using an text editor which can search inside text files and dig through custom and it's contents (or even extracted default hud files) should result in a lot of things to help debug or try out new stuff for huds.