Change to text style for dynamics not preserved across save/load

Windows 7, GIT commit: 77f7d29

1) create score
2) add a staff text and a dynamic marking
3) right click the staff text
4) text properties
5) change style to Title
6) OK
7) right click the dynamic
8) text properties
9) change style to Title
10) OK
11) save
12) close
13) load

Result: staff text is still set to to Title style, dynamic marking has reverted to Dynamics stlye

Reported in http://musescore.org/en/node/24311#comment-94016