ok one more thing to try , backup your wallet.dat and then start with the following flags: -rescan -zapwallettxes=2
wait till you see in the debug.log "rescan 29333ms" , then try again.
Did the wallet rescan and it did his job.
2018-01-04 15:10:30 AddToWallet 221cefce5cd9e32581f513bef0b9938a92430dac37846341eb7db9327eb925e3 new
2018-01-04 15:10:31 AddToWallet 5066a40ac57fc242038a10c4a805571227989e55125a3a324404e805eff0c9dc new
2018-01-04 15:10:31 AddToWallet 48aedb1c05f618d06741f0b66cb3066b94605cfff84d3a5d45c0fdd6de1c80d3 new
2018-01-04 15:10:31 AddToWallet d25042303a338cf535aa8ffd03f48c8b3eb695ee33bdaca76b001b04b69c9411 new
2018-01-04 15:10:31 AddToWallet 5e6cb639ba458667a9d0f1fc203d525dd0bb06235f52c23a51426a0e7063ba76 new
2018-01-04 15:10:34 AddToWallet b4f3957c635ab56baf6cc12a8360e8c4a02804ed629bf2b02019768f07421879 new
2018-01-04 15:10:40 AddToWallet 41611d6ec2b25a89077a76bd8f915a2b99dedf591dc36f7d65519193c184ac41 new
2018-01-04 15:10:44 rescan 29032ms
Booted up the miners and found 2 blocks again..
2018-01-04 16:08:05 UpdateTip: new best=000000fa68809143c4347ed6799d6888c3e545f8365435cbd4d70e3116530234 height=34938 log2_work=39.200781 tx=59333 date=2018-01-04 16:07:41 progress=0.999991 cache=0.0MiB(37tx)
2018-01-04 16:08:05 Block:CBlockIndex(pprev=0xb8f1e00490, nHeight=34938, merkle=6e95b201ee0e5ce5e9e0e5119d31cf074345d491488144de9fa4a716d1ff57b1, hashBlock=000000fa68809143c4347ed6799d6888c3e545f8365435cbd4d70e3116530234, nNonce=1193, nTime=1515082061, location=10237, finalcalculation=4134265587)
2018-01-04 16:08:05 Creating Block...
2018-01-04 16:08:05 CreateNewBlock(): total size 1000
2018-01-04 16:08:05 CreateNewBlock(): nfees 0
2018-01-04 16:08:05 Created Block with miningaddress
2018-01-04 16:08:06 sort earnings flag = 1
2018-01-04 16:13:03 ERROR: ContextualCheckBlock: block height mismatch in coinbase
2018-01-04 16:13:03 ERROR: ProcessNewBlock: AcceptBlock FAILED
2018-01-04 16:51:17 UpdateTip: new best=000000e297d92c20d25a59e2b1b6314e0f63fa5adbd038c9315868f2bb0e28f1 height=34957 log2_work=39.201109 tx=59355 date=2018-01-04 16:50:52 progress=0.999990 cache=0.2MiB(808tx)
2018-01-04 16:51:17 Block:CBlockIndex(pprev=0xb8f6c95930, nHeight=34957, merkle=8d297b0c212279fe19af4931af615e59e128cce56fe3c8887f82954cdfe96ba6, hashBlock=000000e297d92c20d25a59e2b1b6314e0f63fa5adbd038c9315868f2bb0e28f1, nNonce=309, nTime=1515084652, location=132654, finalcalculation=1099234819)
2018-01-04 16:51:17 Creating Block...
2018-01-04 16:51:17 CreateNewBlock(): total size 1000
2018-01-04 16:51:17 CreateNewBlock(): nfees 0
2018-01-04 16:51:17 Created Block with miningaddress
2018-01-04 16:51:18 sort earnings flag = 1
2018-01-04 16:52:13 ERROR: ContextualCheckBlock: block height mismatch in coinbase
2018-01-04 16:52:13 ERROR: ProcessNewBlock: AcceptBlock FAILED
So again both blocks found were not accepted.
And since I am not the only solo miner having this problem... It can't be just all me ;-)
I am willing to try anything else, and boot up the miners and see if it works.