Edit: I think AngeGallego's fix only fixes the difficulty issue and not the ring issue.
I think it fixed none of both. And from my understanding the ring issue wasn't a ring issue, means
after flushing the mem pool problem still excists, but i'am not a coder, just some basic understanding,
but that's what i get out.
You are not a coder but I am.
And yes, this patch fix the difficulty problem - it simple makes next blocks 375 a fixed difficulty blocks where difficulty is hardcoded in patch.
And no, it not fix the Transactions Bug.