It my be a virus. My friend had got one. The same thing is on me. All I can say is that a download was defective and failed along with some others. this acts like a virus but does not register as one. I found the plane and deleted it.

Why!who is this man making defective stuff?why why why

I seem to remember having a similar problem with a panel (can't remember which aircraft), when the panel was deleted everything worked fine again; the aircraft itself was OK.  It happens sometimes, but very rarely.  Always best to load in each aircraft one by one and test fly to isolate any possible problems.  You said "certain aircraft", implying more than one.  Let us know if this keeps happening.