I personally wasn't able to solo mine. Solved several blocks after the 25200 *think I was the one who solved that magical block* I only got multiple rejected blocks.
I've stopped solo mining for the time being to see what happens as Im getting nothing but rejects and that isn't going to help anyone.

I think most of my wallet connections were to people running the old client.
Would it be possible to add into the code that the client would NOT connect peer to peer with the incorrect version?