Curious import from Symphony Pro MusicXML

This problem might well not lie in MuseScore. I am using MuseScoer 0.9.6.3 on a Mac OS X 10.6.6.

I started a tune in Symphony Pro on my iPad and exported it as Music XML. When I then imported it to MuseScore the notes that should have been sharp or flat according to the key signature or accidental were all played as naturals. MuseScore did pick up the key signature correctly.

I've attached three files:

AASB_13754.xml is as exported by Symphony Pro.
AASB_wrong.xml is AASB_1375.xml re-exported by MuseScore.
AASB_right.xml is the corrected tune exported from MuseScore.

The differences between the files seem to be the use of <alter> and <accidental> tags. I do not know which is the correct use and how MuseScore should have interpreted the original. It looks as though Symphony Pro expects notes modified by a key signature to be acknowledged, but MuseScore marks every individual note to make them play correctly.

If it is thought that MuseScore is acting properly then I will report this back to Xenon Labs.