First.
Get rid of the folders you added.
Lets then see if all works ok without FSBuild plans.
This is the location (path/folder) on my PC for iFly flight plans.
C:\FSX\iFly\737NG\navdata\FLTPLAN
What is the path on your system?
Inside the FLTPLAN folder there are many plans that came with iFly installation.
Do you see many flight plans inside your folder?
These are the plans I see ... can you load (as a test) any one of them into your iFly FMC?
Note:
Did you ever read my posts in the iFly General forum in this topic/thread on FSbuild?
http://ifly.flight1.net/forums/forum_po ... d-and-ifly