Seems to be a lot of users still using the old wallet.
When new wallet synchronise with the network & sometime connect between peer to old wallet, it would cause this issue.
Probably dev can update wallet & enforce minimum wallet version for connection between peers.
So old wallet will be abandon till they update
It is not impossible ..
I have selected nodes with the last wallet. But it does not mean that old ones will integrate the P2P network.
On the pool, I'm waiting a next block. If it is still rejected, I will disable and come back after .. sleeping.
What to you get when you type "masternodelist" console on your console ?
Mine is :
{
"6c9c01e0cada2c0f3705322421b70c6b3f84b8027e66609f38ac3c187c19a84f-1": "ENABLED",
"d9196b648d41cd385924b0e91ff88b6030b9b473cf8431f55431cc960e0d3eb7-1": "ENABLED",
"e9c3970e75584d24f40b7ccf0a29730c04a0c72b45e993db6856024d5acedeac-1": "ENABLED",
"31893b340bf92440074b04e266efaeba0f69f1fbbefed66e5acb7f306ab7dd81-1": "ENABLED",
"8e93ea5c9e9e3266db6b8ab53f3cc51d17a26b03f589d7ddaa5c12a28e340b83-1": "ENABLED",
"80ed4f96f6d3d98860a160f045066b0f27934b90701b4c7f23b44c99e7ab2b1b-1": "ENABLED",
"ef8f579ecb63af75b188ec9cd40c00873ecb81791a1cb41f7fdbdb33fd0d11e0-1": "ENABLED",
"b31968189f6af26d2651adf596eb69afe6c818eede91cbacff88f74ad82ea677-1": "ENABLED",
"5456f666b1fc6cf508eda02789a0acba4ec94869dd85d7d3959f3d6c58bd0dac-1": "ENABLED",
"727d86a84362bd2ff21be19b9eab65b78b8d8c40939ddc79de836579d84f0dd0-1": "ENABLED",
"3b2b6e36fdfdd1dd62a758dc24efaaafa418cdbe099507c454842d528cc4351e-1": "ENABLED",
"88ee36d99e73f5a3e3c20c8ccd807cbc9c91513fae3a0fa18cc7482ac9c7931e-1": "ENABLED",
"d1085bcdc32ac95f8b19f51b022f743c206b053dfc482c5d415a3345b9060468-1": "ENABLED",
"5abbb1be890b04d2318dcce3f986521f2db8ec9263d937f8e8c1454001f14a83-1": "NEW_START_REQUIRED",
"162764348ffec1c0c7fc0e74ce84a19f01b018ee334382205518259b0bdc9de0-1": "ENABLED"
}