I spent like an hour and a half trying to fix this last night, thinking it was because I changed the location of the "Documents" directory...before thinking to check the log.
This asset causes an encoding error:
http://www.makehumancommunity.org/cloth ... t_t01.html
I don't see any weird characters in the MHCLO or MHMAT files, at least not in the initial, text parts, but there's something there, and the asset should probably be taken down. Note that it's entirely possible that this is a Windows-only problem, since Windows doesn't play nicely with Unicode.
However, the asset isn't why I'm posting here in "Bugs": the error is being caught, thus preventing the app from crashing (Makehuman is quite good about error-catching), but it's being caught at the level of the entire listing, not the individual item of clothing. The result is that, in the "Clothes" tab, the app displays all the assets it loads before hitting the bad one, and then stops loading, leaving a partial listing. It would be better to catch the error at the level of the asset in question, and skip that one (while putting up a warning).