On the other hand, if having an updated version still doesn't solve the problem, just export your private keys and try another wallet.
Helpful sources:
1. We have started rolling out the new release of Jaxx that supports the latest #Zcash (#ZEC) "Overwinter" upgrade. Users will be able to send ZEC transactions with this update. It will be rolled out to all users over the next few days.
2. How can I view my private keys?