On restart, auto-loaded score has wrong zoom

Context: today commit complied under Mint 14 and Windows 7 (but the issue is there since a long time, under all OSes I use).

Steps:

0) Be sure in "Edit | Preferences | General | Program Start", "Continue with last session" is selected.
1) Open a score
2) Set a zoom other than 100%, say 200%
3) Close MuseScore
4) Restart

Result: the score is automatically loaded (fine!), zoom control says 200% (fine!), but the score is displayed at 100%. Setting the zoom to either 100% or 200% has no visible effect.

Expected result: Either the zoom is reset to 100% both in the zoom control and in the score view or the saved zoom (200% in the example) is restored both in the control and in the view.