Those Red X are coming from SODE, because ANOTHER scenery that use SODE cannot find its objects (its jetways, most likely), this usually because you removed that scenery in the wrong way, or its uninstaller (assuming you used it or it has one), hasn't properly cleaned up its stuff.
You can fix the Red X by removing their SODE files from either these folders:
C:\ProgramData\12bpilot\SODE\XML
C:\ProgramData\12bpilot\SODE\SDX
