The MD-11 uses a very advanced and unique system to deliver such high
fidelity cockpit lighting and panel view options. FS has a 64 window
limit for panels and by default the MD-11 uses up 61 of them. This
means that you have to be aware of this and can only attempt to use a
maximum of 3 other panel windows associated with other addons. This
includes things like FS2Crew, the Active Sky radar gauge, ProFlight 2000
Emulator, and anything else that installs itself as a panel window.
If you go over this limit you will lose MD-11 panel functionality
and begin seeing problems with the panel lighting. If you are having
issues with the panel, especially in the VC, first ensure that you are
not trying to use more than 64 panel windows.