The https crossed my mind too.
At first I saw same things happening after the https switch when I used an internal link that still had a non https link.
That did show the same sort of distorted page too.
However after I detected that link with developer tools in Firefox, and fixed it, that did no longer happen.
After the switch I used the developer tool to detect all mixed content and fixed it in all websites.
All have the green padlock an no warnings of mixed content left and it still keeps happening.
Further more, if this is SSL related ( not sayin it is not ) how come this does not happen if I remove the cache from the equation? I have removed the cache plugin for over a week now on almost every site and these distorted pages do no longer happen in that scenario so if its left over http links, it should still keep happening right?
I have one site with SSL though with same cache plugin and never had this distorted view there.
In the options of the Simple Cache plugin I am using is a feature called "Enable Regex"
See screenshot please: http://www.awesomescreenshot.com/image/2103968/f3e0d42eb4440ed841a16607ff416931
I never used it before, not sure what it does to be honest. If I look it up, it does seem to be related to http - https?
I keep going in circles, testing my brains out..
Do you still think there could be left overs in database, even if developer tools says all is fixed and green padlock is all over the place?
Thanks for you input!