List of Effects to add is unreadable (white on white)

[LxGuru]

The List is unreadable

Same problem for newly created user.
It works in VirtualBox Leap 15.5 and 15.6

How can I make it readable?

OpenSuse Leap 15.5
X11 Plasma
Nvidia GPU

[violetmage]

This is not enough information. In the future, you should follow the issue template (when one is provided) for a project. Please provide the needed information:

Does the same behaviour happen in other menus?

Does it also happen in other gtk4 apps, like gedit?

Are you using the flatpak or a native easyeffects package?

[LxGuru]

Sorry, I didn't see the issue template.

All other menus are OK. I think, "Add Effect" menu is more dynamic that others.
gedit menus are OK.
I'm using the flatpak package (7.1.8)

Why does it work within VirtualBox at the same host?
What else can I tell?

[wwmm]

Why does it work within VirtualBox at the same host?
What else can I tell?

We do not apply customization to those labels. This feels like an issue in gtk4 or libadwaita. Specially considering that one of the horizontal lines is also missing.

Maybe the machine that has the problem is doing something to the libadwaita theme?

[violetmage]

I think this is an nvidia proprietary driver thing, since OP mentioned nvidia+X11. The VM would of course be using a software virtual GPU, so it makes sense the issue would not occur there.