Problem with imported midi files

I’ve updated to the latest version of N-tracks, but I haven’t imported midi files for months, so I don’t know if this is related to the latest version or not:

  1. I import midi type 1 files into n-Tracks.
  2. I set the first track to solo, then I assign it to an n-track sampler instrument. The output is set to my audio card.
  3. When I try playing it back, I get no sound and all meters show nothing.
  4. The same is true of all the tracks.
  5. I go back to the first track and freeze it, then I unfreeze it.
  6. After the first track is unfrozen, all tracks work.

This isn’t a big deal, but it does seem weird and took me a while to figure out.