IS3 suddenly won't recognize object libraries

[irocx 292]

Hi,  out of nowhere IS3 won't "see" my scenery object libraries either residing in the Addon Scenery folder or elsewhere in FSX.  My libraries, housed in a "Scenery Objects Master" folder are certainly active in FSX , as it displays all of the objects previously placed. 

 

When I open a placement file in IS3, I receive a message indicating the libraries are not active in FSX, yet I can see the objects, the bounding box, and can manipulate the placed objects in IS3. 

To date I have tried to uncheck the libraries and rebuild the scenery indices in FSX and I've also deleted the fileindex.dat and filelist.dat  files in the scenery indexes folder.  Fsx will build a new scenery config but still no success with IS3 recognizing those or even libraries which are active elsewhere in FSX.  The only libraries I can choose in IS3 are those residing in the global scenery folder.  I have also unchecked and re-checked the appropriate boxes in the IS3 options menu. 

 

Any suggestions on how to correct this?  Thank you.