Hi Mark,
I actually don't have a plane not showing correctly in DX10. Happened as far as I remember, with imported planes from FS2002. Parts of the planes will no show due to texture transparency channel - SDK differences. But the fixer adds a possibility to work around. I never used this option however.  
As Stevefsx writes in his "Important Note":
The tool works around flaws that exist in the flight simulator core software. Not every DX10 issue can be fixed.
I am more than happy with what he did and as I wrote above the simulator has a new face and better performance.
I use REX, ORBX global, EZdok ... and it's just great.
take care, Lex