Invisible stairs

[mwyatt]

Hi, This error has just started arriving on my P3d.
Win 10 up to date. GeForce GTX 6Gb card, with up to date drivers.
P3D, V4.5, GSX, GSX2, UK2000 airfield. All up to date.
The rear stairs are invisible, The driver can be seen and the stairs cast a shadow.
If there are 2 of these vehicles, front and rear stairs, then 1 is visible and 1 is invisible.
How do I fix this please.
I could not find any posts related to invisible stairs.
Best regards, Martin.

[virtuali]

You probably updated P3D using the Client only, which might not be enough, depending which version you had before. Always update the Content too. If that still doesn't work, try to refresh the shaders, by removing this folder:

%LOCALAPPDATA%\Lochkeed Martin\Prepar3d V4\Shaders