The “received” transactions being sent to the referenced address are all v5 transactions post-NU5. So the problem is that the receiving wallet doesn’t yet support v5 transactions.
If you’re mining to an exchange deposit address, then this exactly explains it. Coinbase are still working through NU5 issues (as mentioned here), so it is likely that the workflow you were implicitly relying on (F2Pool creates transaction sending transparent coinbase to Coinbase’s wallet, then Coinbase creates the protocol-required shield-coinbase transaction) is currently disabled.
The solution here is to not use an exchange address as a miner address. Doing so completely removes your ability to do anything yourself (in fact, you are never in direct control of the ZEC yourself), so all you can do is wait.