Nightly crashes when trying to view newly edited parts

I have been using Nightly f794aee on my Windows 8 laptop without problems.
After editing the flute and the violin voices and creating the parts for my score (V2), the Nightly always crashes when I try to view the violin or the flute part. All other parts work fine.

I managed to get a working copy by exporting as Music XML, then opening that in an HTML editor and saving it after minimal editing. Opening that score in the Nightly resulted in a copy where I can view all parts without problems. However, in that copy (V2a) there are no pizzicato channels that I can select, whereas pizzicato works fine in the original score.

Can someone please look at those almost identical scores and tell me what is wrong with each of them?