Still can't solo mine this coins.
From the around 6 or 7 blocks found this evening... every one got rejected.

2018-01-03 20:39:44   nActualTimespan = 2898  before bounds
2018-01-03 20:39:44 params.nPowTargetTimespan = 1200    nActualTimespan = 2898
2018-01-03 20:39:44 Before: 1d757750  0000007577500000000000000000000000000000000000000000000000000000
2018-01-03 20:39:44 After:  1e011bae  0000011bae383d70a3d70a3d70a3d70a3d70a3d70a3d70a3d70a3d70a3d70a3d
2018-01-03 20:39:44 ERROR: ContextualCheckBlock: block height mismatch in coinbase
2018-01-03 20:39:44 ERROR: ProcessNewBlock: AcceptBlock FAILED

2018-01-03 21:41:07   nActualTimespan = 1080  before bounds
2018-01-03 21:41:07 params.nPowTargetTimespan = 1200    nActualTimespan = 1080
2018-01-03 21:41:07 Before: 1e01ab69  000001ab69000000000000000000000000000000000000000000000000000000
2018-01-03 21:41:07 After:  1e0180ab  00000180ab4ccccccccccccccccccccccccccccccccccccccccccccccccccccc
2018-01-03 21:41:07 ERROR: ContextualCheckBlock: block height mismatch in coinbase
2018-01-03 21:41:07 ERROR: ProcessNewBlock: AcceptBlock FAILED

Perhaps will remove and reinstall wallet again... perhaps it might help...
Dunno... Or I'll just stop mining and try to find some other coins...
And it's not that it was not working.
Found arround 20 blocks in the days before 1 Januari.

If someone has a suggestion on how to get this going properly, please let me know...
Else I have to go to the pool... And thats less profitable for me.

Thanks for any help!