Did you only read this one page? I have answered this several times.
I had this problem - fix is as follows.
Make sure you are up to date -
https://mega.co.nz/#!s0pSHZra!rON4Y4CnRtsY76oKg_6akuEkpvcprNBMy4pRiRlFLtc
Once up to date close app
Goto your appdata folder
Delete everything BUT wallet.dat and config file
Reopen app.
It will work.
Sure worked and my wallet synched-up, but showed only a recent deposit into my wallet.
My original 5000+ FACs had disappeared.
faircoin-qt.exe -rescan did not help, my original FACs were still gone.
Luckily I had an old backup of my wallet before the hard fork fiasco happened.
I renamed my backup file to wallet.dat and ran faircoin-qt.exe -rescan again; got all m y FACs back.