General plugins

I don't know if you found an answer to your problem, but I was having the same issue. Most of my teachers would see their list of Current Dialogues just fine, but one teacher just got the message "User's record not found". I tracked it down to incorrect data in my database. In the mdl_dialogue_conversations table I found an entry with a recipientid and lastrecipientid of 0. Since I don't have a user with an ID of 0 I knew this was wrong. I changed the two fields to the ID of a valid user and the error went away. Note that since I didn't actually know who this dialogue should have been for (since the value was 0), I ended up just finding the dialogue and asking the student to re-enter it. Hope this helps.