(bug report) Problem with updating instances in preview panel

I already had similar problem with preview panel:

  1. I just updated Glyphs to the new version (957).
  2. Added new master from previously exported instance (extrapolated bold).
    Masters’ compatibility is OK everything seems fine (I have 3 masters: thin-regular-bold).
  3. I created new instance: semibold.
    (here appears my problem:)
    I can see semibold instance in my preview panel, but It doesn’t update, when I changing shapes of the letters.

Does it work better if you reopen the file? If not, could you send it to me?

It does, thanks