Hi,
I think there is a bug when saving elements as "Shared Blocks" (the problem is not present with "Saved Blocks").
A black background is generated each time on the back-end, on the front-end it seems that the display remains correct
Have you noticed this bug too?
Short screencast
Thanks,
Lorenzo
Hi Lorenzo,
Could you backup your site and install the latest version of T4 Builder?
https://www.joomlart.com/member/downloads/joomlart/t4/t4-page-builder
I tried to replicate the same but it worked properly.
Hi Saguaros,
... no change, I put login access to the back-end, it's a test site so you can try on your side. Thanks.
It's weird as when I tried to do the same with shared block, it worked properly.
As you can see that I saved a block called 'jatest' >> I set the background color >> saved block and it's showing the same.
Hi Saguaros, I really think it's a bug with T4 Page Builder...
I tried on another clean Joomla installation with T4 Blank as the main layout and then with only Cassiopeia template, the result is exactly the same so it's obviously that it's a T4 Page Builder bug... it's quite annoying 
I've shared this to our T4 Builder team for further checking, I will keep you posted.
