My machine is OSX Mavericks 64bit:
I installed via homebrew: brew install mit-scheme.
This website gives the details of the way the install runs.
https://github.com/Homebrew/homebrew/blob/master/Library/Formula/mit-scheme.rb
(identify-world) gives:
  Release 9.1.1 || Microcode 15.3 || Runtime 15.7 || SF 4.41 || LIAR/C 4.118
  Edwin 3.116

To get this to hang you just ./mit-scheme sans --edit
1] => (sleep-current-thread 100) and mit-scheme-c goes to 100%
When I saw the ..-c I remembered that home-brew compiles everything so:
I downloaded the binary and:
cd /Applications/MIT:GNU Scheme.app/Contents/Resources
./mit-scheme
1] => (sleep-current-thread 100) works as expected

I occasionally use large vectors so I'll keep LIAR/C around but switching
to LIAR/x86-64
solves the (sleep-current-thread ...) problem.
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