For anyone else who has this issue, the solution I found was to update to the latest Zecwallet Fullnode v0.9.12 (zcashd v3.0.0), rename the old wallet.dat file, start zcashd and allow it to create a new wallet.dat file, then import the private key for the address. Once I did all that, I was able to send the funds out of ZecWallet Fullnode without any isues (for one of the addresses at least).