Formatting problems when extracting parts from a Capella file

Musescore does brilliantly when it reads in the attached Capella file until one creates parts from it. Then a number of serious issues emerge:
1. The existing clefs and in some cases key signatures are retained in the middle of the lines of the parts.
2. The title, having been a 10 point font in the score becomes 24 point in the parts and overflows the line.
3. If you have added an ambitus then the flat in the ambitus of the first part migrates about a cm. to the right into the first bar, and clicking on it changes the view to that of the score.

Such a pity, because I find Musescore much preferable to Capella when extracting parts.