Hi!
I'm having this same issue at http://pincelyserpentinas.businesscatalyst.com
I've tested the following scenarios with no improvement:
- Eliminating 0 scroll shape fills: Site scrolls properly.
- Eliminating all zero scroll shape fills but one: Site jitters
- Eliminate all shadows with only one zero scroll shape fill: Site jitters.
- Test in Safari 7.0.4 with only one zero scroll shape fill: Site Jitters
- Test in Chrome 35.0.1916.153 with only one zero scroll shape fill: Site Jitters
- Deactivated HiDpi: Site Jitters
0 scroll shape fills is the only scroll effect I want to use in this site and it messes all the site up.
I believe is a Muse CC 2014 version issue since I was working on this site on the previous version of Muse with no issues at all.