I found metapost broken with the new updates. I have some old metapost
figures that use the boxes package. Now they cannot compile. I tried
them on Linux and they are fine. The boxes.mp file seems innocent, since
I compared it to the one on the Linux system I used, and didn't find
offending differences. But metapost compiles fine if I don't use boxes.
(Or maybe it's fine if I don't use vardef or other similar stuff. I
didn't try that though.)