I just ran into this bug again. Changing the style properties does not fix the problem. The main feature of this bug is that the section line colours are correct when viewed in Raster mode, the bug crops up for Vector/Hybrid mode.
Another feature of the bug is that changing the style does not change the section line colour in Hybrid/Vector mode.
Currently, the only workaround is to create the Section and Scene again.
Other reports of the bug:
http://sketchucation.com/forums/viewtopic.php?f=12&t=64223