Hello,
I just recognised all local video files do not display, left w. blank page (all embeded video and youtube videos work fine).
This site has been working for years. The only update I made recently is to install ssl certificate on the domain, i.e. now running from https://
Here below is an example
www.terziev.info/en/filter-by-view-2/item/139-on-crisis-with-rhytm

Any ideas what might happened.

Hello,

I can see the video /media/k2/videos/139.mp4 as expected. Make sure to clear your browser's cache.

Well, after hours of investigating I found out some css styles must have been changed in the last version. I changed my custom css and now everything is OK

Nice to hear that you got it working :)