And version 5.5.0.1975 does not ? (5.5.0 Final) they are both still built with VS2013. Only big change is compiler and that is only for the 5.5.1 beta
But I don't see how change of compiler can cause this.
Btw what file(s) date was changed ? the Config/ folder or its content.. Under userprofile or Program files ?
5.5 final probably works ok but i've replaced exe with 5.5.1, will check later
I had the problem with Aliases.xml in the Config folder of MC portable. If i change year to e.g. 2015, MC starts ok. If i change it to 1614, error occurs. Haven't tried other xml files, but i think that result will be the same
P.S. It's on Win 7 Pro