We need to stabilize CNO first before any dev or considering moving to a new forum (or staying) or any other actions.

Ok, but how? I have one wallet that will not sync (tried syncing from scratch), another that syncs fine but does not receive anything I send to it. When I try to solo mine I get nothing (tried both wallets). Mining results in about 70% rejected (1.26 MHz ASIC, nothing big), CPU mining is not giving anything. I also moved a small sum between the wallets, all lost.
Or is the blockchain just not moving? Forked? It is possible to mine at ProHashing, but given all these uncertainties I put everything on halt for a while.
Not sure about your sync problems. Have you tried checking that the hash of the most recent block on your "problem" client matches the same block on your fully synced one? (ie, the hash of the highest block on your problem client can also be found on your good one.)
Are the clients on the same machine and OS?
Mining at a low difficulty will result in a high reject rate, because your miner finds (and submits) multiple solutions to the same block before the client fully processes the block and the miner is directed to work on the next one.
Note that all COINO coins have been mined, so although you can create new blocks, they do not have any reward.