The MAT preferences that were removed (along with the deprecated MAT Optimize tab) seem to still be mistakenly referenced somewhere. When clicking the Apply button in Preferences, the textport gets spammed with this:
/ui/dialogs/dialog_preferences/savepreferences (Line 6 - preference -s "$prefvalue" $preference) :Warning. Cannot find any matching preferences to mats.dontrenormeyevec
/ui/dialogs/dialog_preferences/savepreferences (Line 6 - preference -s "$prefvalue" $preference) :Warning. Cannot find any matching preferences to mats.dontrenormlightvec
/ui/dialogs/dialog_preferences/savepreferences (Line 6 - preference -s "$prefvalue" $preference) :Warning. Cannot find any matching preferences to mats.dontrenormnorm
/ui/dialogs/dialog_preferences/savepreferences (Line 6 - preference -s "$prefvalue" $preference) :Warning. Cannot find any matching preferences to mats.dontrenormspotvec
/ui/dialogs/dialog_preferences/savepreferences (Line 6 - preference -s "$prefvalue" $preference) :Warning. Cannot find any matching preferences to mats.fastdeformtangent
/ui/dialogs/dialog_preferences/savepreferences (Line 6 - preference -s "$prefvalue" $preference) :Warning. Cannot find any matching preferences to mats.fastnormhalfang