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    $\begingroup$ The replacement is not used at all (as the left hand side of the rule does not match anything in the list), though WhitespaceCleaning@a is evaluated before any replacement is done, and its argument is not a string, so an error message is issued. Try RuleDelayed (:>) instead of simply using Rule (->). $\endgroup$ Commented Jun 26, 2012 at 19:48
  • $\begingroup$ @IstvánZachar: I replaced -> with :>. Works now on Windows. However, both -> and :> return the same result on my Mac. I don't understand why "the left hand side of the rule does not match anything in the list". In ImportData I have two lists which do match the pattern {a_, b_, cc_, d_, e_, f_, g_, h_, i_}. $\endgroup$ Commented Jun 26, 2012 at 19:57
  • $\begingroup$ Sorry, my mistake: it does match. Do you load any custom packages on your Mac? Did you make sure no previous garbage is left in the kernel? Better run on both machines with a fresh kernel. $\endgroup$ Commented Jun 26, 2012 at 20:03
  • $\begingroup$ @IstvánZachar No problem. I did not load any custom packages and I run the code with fresh kernel on both systems. Problem remains. $\endgroup$ Commented Jun 26, 2012 at 20:06
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    $\begingroup$ Note that you can use StringTrim for your whitespace cleaning: reference.wolfram.com/mathematica/ref/StringTrim.html $\endgroup$ Commented Jun 26, 2012 at 22:22