@SCscott: Thanks for reporting the issue with materials build. I just checked, the issue was caused by updates for a different game. It should be fixed now in the updated build, which you can get from
this topic as usual. Just don't forget to disable animations, if you're opening steam version.
On a side note, for some old games listed as supported in
compatibility table usually it's worth to check official build as well, because occasionally compatibility in "materials" build can be broken. Though it would be better to report the issues with it.