I recently purchased the Janome blue tip needles
and had the same problem with my 11000. Took it
out and put it back in to be sure it was in the right place,
and the threader still would not catch the thread. I have
no problem with the Schmetz or Organ needles.
I wonder if something has changed with the needle production.
In the past I have had no troubles with the Janome needles.