Using this data against my test3.pl, I get the following results:

D:\PerlMonks>test3.pl
DEBUG:  -----------------------------
DEBUG:  $yrcr.$mocr = [2004.08]
DEBUG:      $yr.$mo = [2014.12]
DEBUG:  -----------------------------
DEBUG:  $yrcr.$mocr = [2004.08]
DEBUG:      $yr.$mo = [2014.12]
DEBUG:  -----------------------------
DEBUG:  $yrcr.$mocr = [2004.08]
DEBUG:      $yr.$mo = [2014.12]
DEBUG:  -----------------------------
DEBUG:  $yrcr.$mocr = [2004.08]
DEBUG:      $yr.$mo = [2014.12]
DEBUG:  -----------------------------
DEBUG:  $yrcr.$mocr = [2004.08]
DEBUG:      $yr.$mo = [2014.12]
DEBUG:  -----------------------------
DEBUG:  $yrcr.$mocr = [2004.08]
DEBUG:      $yr.$mo = [2014.12]
DEBUG:  -----------------------------
DEBUG:  $yrcr.$mocr = [2004.08]
DEBUG:      $yr.$mo = [2014.12]
DEBUG:  -----------------------------
DEBUG:  $yrcr.$mocr = [2004.08]
DEBUG:      $yr.$mo = [2014.12]
DEBUG:  -----------------------------
DEBUG:  $yrcr.$mocr = [2004.08]
DEBUG:      $yr.$mo = [2014.12]
DEBUG:  -----------------------------
DEBUG:  $yrcr.$mocr = [2004.08]
DEBUG:      $yr.$mo = [2014.12]
DEBUG:  -----------------------------
DEBUG:  $yrcr.$mocr = [2006.02]
DEBUG:      $yr.$mo = [2014.12]
DEBUG:  -----------------------------
DEBUG:  $yrcr.$mocr = [.]
DEBUG:      $yr.$mo = [2014.12]

D:\PerlMonks>
[download]

I still submit that your failure to close IN before re-opening it is probably still part of your problem.

Regardless, as you can see from the debugging statements, your if() statement is never true, so the script never has any reason to write any data.

Good luck!