I had the same problem with FS9 models built by POSKY. The end result had to do with lines of code missing from the stock panel that came with the download and replacement panels I was using. Why that f'ed up the landing gear is beyond me but transferring the code did the trick.
The basic gist of the mod from the stock POSKY panel (A) to the one I was using (B) was copying the following from A to B
[VCockpit03]
size_mm=512,512
pixel_size=512,512
texture=$Posky_ACU
background_color=0,0,0
gauge00=Posky744!PkyCALC, 140,80,140,80
gauge01=Posky744!PkyNosegearheight, 140,80,140,80
gauge02=Posky744!PkyBodygearheight, 140,80,140,80
gauge03=Posky744!PkyWinggearheight, 140,80,140,80
gauge04=Posky744!PkyLeftgearboggie, 140,80,140,80
gauge05=Posky744!PkyRightgearboggie, 140,80,140,80
gauge06=Posky744!PkyLeftwgearboggie, 140,80,140,80
gauge07=Posky744!PkyRightwgearboggie, 140,80,140,80
gauge08=Posky744!PkyNosegearsteerling, 140,80,140,80
gauge09=Posky744!PkyWINGROOTFLEX, 140,80,140,80
gauge10=Posky744!PkyRWINGMIDFLEX, 140,80,140,80
gauge11=Posky744!PkyRWINGTIPFLEX, 140,80,140,80
gauge12=Posky744!PkyLWINGMIDFLEX, 140,80,140,80
gauge13=Posky744!PkyLWINGTIPFLEX, 140,80,140,80
gauge14=Posky744!PkyRudder, 140,80,140,80
And then adding to the Aircraft.cfg file:
window08=Posky Utility
[Window08]
VISIBLE=0
position=2
size_mm=204,80
child_3d=0
background_color=0,0,0
ident=Posky Utility
gauge00=Pky_Util!Pky_Init, 0, 0
gauge01=Pky_Util!Pky_Timer, 0, 0
gauge02=Pky_util!Pky_Util, 0, 0
No idea if the above fix would apply to a model which has been transferred into CFS2, but it could provide a start. I'd love to see a CFS2 bellybutton!