The reason that it is so often suggested that you read the manual, particularly with square balers..... is that the book generally has some fairly specific trouble shooting charts along with pictures of failed knots and explanations of why they failed. For my own part I can't imagine sitting here looking for answers of unknown validity, to a problem with a baler knotter... when there is hay to be baled and rain coming. Sometimes 10 min worth of reading and looking at the pics presented will have your problem fixed vs sifting through 20 posts on here made by people who may not understand the problem you've encountered if they've read the original question at all...
In the case of your baler it sounds to me like it's dropping the twine from whatever twine holder that knotter has... but I'm not familiar with the MF knotter... so I'd have to read the manual.
To me it's one thing to try and help someone who can't get a manual or is waiting on one to arrive... but to deliberately decide that one isn't needed because there's an online forum somewhere... is rather foolish to me. I've also never found an old baler that I couldn't get a reprint manual for... from a dealer... in about a week... for less than 40 bucks. All the more reason to own one.