I have the same issue, contacted support and they advised me to use a workaround of using the same background colour as the default background colour on all of my "other" pages.
I have a blue background as default, when moving to other pages that have sections colored in white or dark brown, the blue background seems to load in beforehand.
It creates this odd quick flashing when clicking other pages.
I'll try Chele's fix and see if it works for me.