Try right clicking on the P3D Icon, click on properties then compatibility's and check the box that says "disable fullscreen optimizations" click apply and see if that works. It did for me.

I thought alt+enter were the keys to switch from windowed to full screen.

Thanks. I will give that a try.

Did a search and found that V sync had to be turned on.

I have had the Academic edition installed and all worked fine. I had to remove it from my system and reinstall it. Now, now no matter how many times I install it, the screen has a flickering that I can't seem to find the cause. Would anyone have any ideas?

I had it but only in the windowed mode. When I switched to full screen the flickering disappears. Installed the latest nVidia driver and it stopped.

I was just wondering. In the default FSX and FSX-SE, one could close the default ATC window when flying. However, if one had a message from ATC, the pop up window would appear immediately even if you had the sound off. I like to fly listening to a podcast and don't like the delay between the ATC com...

Read the attached link. Hope you find an answer that works for you. Mine now works fine.
https://www.prepar3d.com/forum/viewtopic.php?t=128612

Question answered. I don't fly GA so small airports are not my choice. Thanks for your opinion however.

Lumberjack is a small app. that removes trees that are placed at each end of the runway which is not realistic. It works great in FSX and I am told it works with P3DV4.2. The instructions say to install it in the Add on Scenery folder. I don't see that folder in P3DV4.2. So....any ideas on where to ...

A Google search came up with many posts. https://www.google.com/search?source=hp&ei=Tw8ZW_WtDeeS0gKmyZmwAQ&q=trees+on+runway+fsx&oq=tree+on+the+runway+fsx&gs_l=psy-ab.1.0.0i22i30k1.2049.14980.0.17322.29.22.3.3.3.0.172.3098.0j22.22.0....0...1c.1.64.psy-ab..1.28.3146.0..0j35i39k1j0i131k1j0i131i20i264k...

Thank you for that reply.
Bob G.

Hi Mike. FSX had trees that were not realistic as to their actual location of trees at the end of the runways. So.....to fix the problem someone created a small fix that would remove the trees where landing was impossible because of the close proximity of the trees to the end of the runways?

What works for me is to restart my computer and then the ATC is visible and it works. That is after I start P3D4.2 and it doesn't work.

FSX had a add on app that would clear the trees from final approach called Lumberjack. Is there such a app that would work with P3DV4.2?