I changed line 91:
| active => (!($checkAnswers or $previewAnswers) and $ce->{pg}->{options}->{enableShowMeAnother} and ($problem->{showMeAnother}>-1 or $problem->{showMeAnother}==-2)), |
which previously didn't recognize $showMeAnother{active} when $problem{showMeAnother} was set to course default by having the value -2.