Kneeboard Problem: can't turn pages

[JG4_Sputnik]

Hi,

 

it works with every other aircraft, but in the F86 I can not turn the kneeboard pages whatsoever. Also the kneeboard doesn't show up on the pilot's leg once he is enabled. There's only an empty black case and a pen.

 

I have the "Museum Relic" campaign enabled, don't know if this is relevant. But I don't have any other campaigns and in other planes, it works.

 

Any ideas?

Thanks in advance!