Win32 FFI fails for some time now. For example, load latest versions of FFI from http://source.squeak.org/FFI Then try this snippet:
FFIPluginTests new testGenericDoubleCall.
And you'll get a segmentation fault, crash.dmp. The latest vmI found in bintray already has the problem. https://dl.bintray.com/opensmalltalk/vm/:cog_win32x86_squeak.cog.spur_201606...
This bug delayed the Win64 squeak.stack.spur delivery, because I thought I introduced a regression somewhere...
I did not have time to check other OSes, but it would be worth trying. (Before declaring any VM+plugins as stable...)
If someone has a way to easily dissect without precompiled artifacts, let me know.