I had my daughter (Orchestra Geek) play this for me last night, it sure sounded hideous. She quickly made a tweak and it sounded very pleasant. I think the scale she played with identified the needed tweak (but she found it by playing it first)
BTW: She also noted that the background was a bass clef, so she superimposed 9 bars with the with the Treble Clef and played it and it sounded surprisingly good. Not sure how she dealt with temp differences.
To us both, a "mistake" is the result as written. However, as yet no good propsed solution yet here either. We both believe we're dealing with an classical "orch dork" here and it takes one to know one :0
I was just perusing this thread again...
I know it was a few months ago, but which key did she use to make it sound decent?