Hi,
I just found this while I was looking for something else. Apparently, the passphrase was longer in 2013.
"I think the older wallet was cutting the the passphrase at the symbol %, so to access account in a newer wallet i needed to only put the part of the passphrase before the % symbol."
So do not use the % and everything after that if that is the type of passphrase you have.
Good luck