Reference Cards SketchUp 2019: strange Overlay

the reference cards do show a spooky brownish tint as well as a shadow (?) overlaying the ref. card content:

LayOut versions are fine:


I’m not seeing it. I followed your link and see this:

The background appears white to me.

And in Adobe Acrobat Reader…

Did you really want this in the Tutorials category?

I see the shadow in FF but not in Chrome.

you’re right, PDFs are fine in Acrobat. Fx’s integrated PDF viewer seems to be the culprit, which is spooky anyhow with the LO versions showing fine.

Tutorials… Documentation… pls move to category ‘Meta’ or whatever you think suits better.