You cannot host a masternode and wallet in the same client anymore as it is a security risk. With 0.12.2.4 you can comment out masternode=1 in your config in order to regain access to your funds. I'm pretty sure that 0.12.1.8 is no longer accepted by 0.12.2.4 clients so if you send with an old client you risk losing the funds due to being on a wrong chain. You do have the chance of regaining the funds though with a resync with the latest wallet and using zapwallettxs on the command line if you have tried sending with the old client and its not showing up (on an exchange or from wallet to wallet transfers)