since my update from xstore 3.4 to 3.5 I experience several issues.
On my page http://alpenland.inspiras-qm.de/typenserie/ I am using a parallax section. For the two columns I set a Custom CSS Class ‘p-weiss’. This worked well in the former theme version. Now it is not possible for me to assign the Custom CSS to these 2 columns.
Check the screenshot http://prntscr.com/dwcy59
Very likely you changed the body color in theme options and it has more priority than your custom css. We have added <p> tag to the list of classes that could be changed by this option.