Can no longer even read conversations that say "This conversation is too long, please start a new one."

That doesn’t sound right. Even if a conversation has reached the length limit, you should normally still be able to open and read it, so seeing blank chats or getting redirected immediately is definitely worth investigating. A few quick questions that would help narrow this down: * Is this happening on the web app, mobile app, or both? * Does it happen with all long conversations or only certain ones? * Around when did you first notice this happening? ~ Smith