Found a few bugs using 51.2:
If you have a gal following you, are in their bedroom, and their sleep time hits, they go to sleep. However, this doesn't cancel the follow mode. So if you move out of the room, they'll follow you, but you'll get error messages when doing certain things (like telling them to stop following you). Seems like either they shouldn't go to sleep while in follow mode or else going to sleep should end the following.
The St. Patrick's Day event had a bunch of missing images. I believe I stayed with the guest red head for the various choices. It also had some trouble, I think, due to my having a gal in follow mode when I started the event.
Ayane has no hint text for reaching the 3rd obedience level. Just a -.