hmmm... I went back over the previous week and looked at all the races my dogs competed in, and nothing was mentioned. Nothing in the instructions about banning, either.
But it ended happily enough. I just ran a couple of weeks and now I'm able to enter dogs normally. I didn't miss any significant races. My dogs which had made the semi-finals in the Stayers Cup prior to me being banned were still able to compete in them. It's all good.
I guess the punishment taught me a lesson... whatever it was I did, I sure won't do it again.
Hopefully this gets handled better in GM2.