superdoc:

Could it be that when you call 'some_subroutine()' with a certain parameter it alters the globally scoped variable '$coderef'? IF 'some_subroutine' looked like this:

sub some_subroutine {
  if ($_[0] eq 'arg1') {
    $coderef = \&some_other_subroutine;
  }

  return ($value1, $value2);
}
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The second calls to '$coderef' with 'arg2/3' will call '&some_other_subroutine'. This is the nature of the coderef -- my logic is wired to the '$codref' and the executing code can change where that reference points to.

I suppose this could be 'the basics' of it, but if you're looking for *deeper* insight, I'm sure we could provide some of that too... :-)

Kurt