Folks using v0.17, keep an eye on your blocked users list. The new filter is trying to block spam by checking duplicated messages with > 50 characters.

I don't know if that is a good idea, it has been working well for me during the past day. Let me know if you find a blocked user that should not be blocked.

Also, although the list appears together with your usual block list, the auto-block is kept separately and deleted after some time (more like a timeout than a block). But you can always choose to see the user again in that interface.