Beecher Pass USFS Cabin is from the RTMM Missing Cabins scenery piece. But hmmm, some smoke but that's it.!! Reinstall the RTMM Missing Cabins scenery piece first.. but have you updated Part IV of the Libs?.
Make sure you have installed the Part IV lib updates (which also includes updates to the previous libs). You need this to see the objects.
Now this cabin is in the Wrangell area. Make sure you have the P3Dv4.4 AI traffic fixes in that are required as shown in P3Dv4 > Step Table 9 and Step Table 10:
Page link:
http://return.mistymoorings.com/getting_started/index.php#9So 3 things to do
1. Reinstall RTMM Missing Cabins
2. Make sure you have installed Libs Part IV (Which includes updates for the previous RTMM Libs)
3. Put in the AI Traffic fixes for P3Dv.4.4. (I think I did these for you already but re-check to make sure.
Norm