error: {"code":-4,"message":"Error: The transaction was rejected. This might happen if some of the coins in your wallet were already spent, such as if you used a copy of wallet.dat and coins were spent in the copy but not marked as spent here."}
Pool is now closed.
I'll try to reindex the wallet by restoring from privkey now. A simple rescan, rehash and a repair wallet didn't help.
Have you tried downloading the blockchain again, sounds like you have a corrupt blockchain?
Blocks are being mined somewhere and the POS blocks are moving the chain along.
Your pool displayed all orphan blocks which means it was trying to get blocks that were already allocated, so someone may be 51% the blocks or another pool is getting all the blocks.
Im not familiar with that error.