It seems that some use of alpha channel with red background color are really not well managed, in youtube for example ( it happen only in some part of the youtube web page composed with red color).
the button of youtube or the red background in a bottom part of a video, i join the example :
does it related with Nvidia driver ?
i use a MSI laptop with Nvidia/Intel GPU and XFCE DE.
nop, it change nothing !
I think to have seen this problem not only youtube web page, even in 3 differents browsers too.
And i do not remember well in few desktop apps also.