P3D V5.1 HF1 - Effect issue

[Thomasfa]

Hi there,

First of all, I wish you a happy New Year 2021.

I have a problem with effects. Specifically the touchdown effects of my loaded plane and ai planes.
I use a multi monitor setup with a 4K TV and 3 HD monitors.
I run P3D on my 4K TV. This is attached to an RTX2060 Super card. The other monitors, which are attached to the 1080 card, have undocked 2D-displays of the instruments. For example from the PMDG 737, PMDG 777 and QW787. This actually works very well with good FPS.
Now I like to look at the AI traffic. Unfortunately, I don't see any touchdown effects during the landings. No effects can be seen on my loaded plane either.
Now the strange phenomenon. If I remove all 2D displays from the monitors, the effects are suddenly visible.
Do any of you know a similar problem? Is there maybe even a solution? That would be great.
Best regards from Austria
Thomas