Background image gone after wp upgrade

Found that the problem seems to be with Autoptimize plugin.
Once Autoptimize is deactivated the site is back to normal and background image is showing.

Found that the problem seems to be with Autoptimize plugin.

it’s a bit more complicated than that actually ??

workarounds (until wordpress 4.7.1 is released) are:
* disable the “also aggregate inline CSS”-option
* use the code snippet here to fix the background-url

hope this helps,
frank