Bottom part of my screen is blank

Uninstall the aircraft that you just installed.
Only load one at a time so that if a problem arises you can narrow it down to the last add-on.
If that doesn't work, post a screenshot so we can see.

Suddenly, it works. No adjustments made. However, I will install that plane.

You using virtual cockpit or 2d? What could have happened is you were in the 2d cockpit view and you turned off the instrument panel... if it happens again hit Shift+1.

When it was happening, shift+f1 did not work. In fact, it would open up the 2D panel, but I hate the 2D panel. But when you went back to virtual cockpit, the part of the screen that was blank had the remnants of the 2D cockpit. But none of the switches would work. Even when you right clicked the screen with your mouse and that pop-up window appears, it too would remain at the bottom of the screen non-functional. But the problem is gone, and I uninstalled that aircraft.

Weird... Good thing it fixed itself 😀

I get you with hating the 2d panel, i only use it when switches in the VC are too awkward to click.

Me2. Ctrl+1 usually works in most planes, unless IFR panel is available, then I have to do some clicking.