4-master interpolation erratic in 678

My instances appear different (wrong/broken/unpredictable) in the latest beta (678)

Screencast:

http://cl.ly/273s1k2j1k2S

Happy to provide .glyphs file if needed

Could you send me the .glyphs file (to support at this domain)?

I’m having the same thing with a 2-master file. G2 [678]

I changed the algorithm that calculates the interpolations. It is generally more reliable but seems to fail with not 100% correct master settings. In a two masters settings is easy to fix. Set the Width and Custom values to the same value in all masters and instances. To know whats wrong with the four master file I need to see it.

Thanks

I fixed it. Please get the update.

confirming fixed for me, also fixed multiple brace layers.

Thank you!