sandbox with default configuration can no longer load `2htdp/image`

Origionaly from https://groups.google.com/forum/?fromgroups#!searchin/racket-users/libobj%7Csort:relevance/racket-users/W_-4aN7kPyI/cwgwz2xIBAAJ

Two small example of this:

(make-module-evaluator `(module m racket (require 2htdp/image)))

(make-evaluator 'racket #:requires '(2htdp/image))

These errors with one of the following, depending on the machine.

file-or-directory-modify-seconds: `read' access denied for
   /Users/florence/Library/Preferences/org.racket-lang.prefs.rktd

file-exists?: `exists' access denied for libobj.so

file-exists?: `exists' access denied for libobj.dylib

file-exists?: `exists' access denied for libpng16.so.16

I'm not sure when this broke, but it worked on 6.2.1 (When using the handin server at least).

I also have not been able to find workaround by setting sandbox-path-permissions, other than setting 'read for "/".

Reproduce the two examples using make-module-evaluator and make-evaluator with 2htdp/image, and compare the reported permission failures across machines. Read the sandbox-path-permissions behavior and the default sandbox configuration first. Done means the default configuration can load 2htdp/image without granting read access to the entire filesystem.