Images missing in Safari and apps

[ps3zocker]

On some websites (like web.whatsapp.com) and in Tweetbot (and some other apps) images will either not display at all or they are just black and/or distorted. Has anyone the same issue on Sierra? In the case of Safari it seems like it only affects navigation elements (probably SVG images). If I remove the website data it works again, until I refresh the page.

 

[Ulenspiegel]

What Safari extensions (adblocker etc.) do you use?

 

[ps3zocker]

I disabled all Safari extensions. This only started with macOS Sierra.

 

[Ulenspiegel]

Have tried resetting Safari? (sorry for so many questions, trying to guess what can be the problem).

 

[ps3zocker]

Just did. Worked until I refreshed the page again.