0.9.6b 2438...loosing 0.9.5 scores

Some modification, particularly adding glissando, or changing the chords chart, and after saving, the score appears empty....

Well: go to the file, extract the mscx file, and open it with Musescore: a message says where is the fault in this xml file.

And, indeed one find a silly line at the end of the Style section, there is a mark who has no name..