If I try to save matches I only get a "this mare have a match" message, and there is no matches made in matchmaker at all?

I have the same issue, but it may be that the mare has a match in another stable?

Hm, it's my mare...so I don't know LOL

Yes but remember other people can also match your horses. I had your mares matched earlier here and deleted the matches so try again maybe?

Ah, now it works. Thanks :)