As the title suggests, I made the plane, flew it about for a while, was very happy with the result. Reverted to SPH and this happened. It happens every time I load it too even though the mini-icon in the craft folder looks like it should.
If you need any info let me know
How it should look
https://imgur.com/rgDy73t
Sat on the runway fine after hitting launch
https://imgur.com/ktbXmnr
Every time I hit revert or load it up again...
https://imgur.com/4nc5KjU