Wow thanks - if needed I'll give you access as soon as I can - the contents are too sensitive right now tho so cannot do that just yet ;)
As for the settings and overall maintenance, everything is up to date (Version: 2.5.6) and I only have the carousel plug-in which is the latest version.
I also noticed that svg's aren't accepted as images if I'd want to add any via the standard img add option inside the page editor - is that current standard or is this whole thing a rare case of available updates not showing up? I had this issue once before when a LAY update was available/announced but not visible inside my backend until a few days later.
Again, any intro type other than svg works fine and updates immediately. I tried different size values, both absolute and relative, from small to large, but the svg won't show..
Is there a need for specific export parameters when creating the svg in the first place? It opens fine in Chrome, Firefox and Edge tho, so I am at a loss.
Any ideas are welcome!