I dont have FM, but maybe the materials just need to be loaded in to TC ?
Open the Material Palette and see if there is a FM Group in there, else make sure you have the selection from TC database, rigthclick inside the Palette area and select "Load From", then see if there is a folder or a .mat file there that is related to FM somehow, Select it and click Open.
If/ when the material is loaded in a catagory/ Group, open it and see if the materials have a Preview, if not, Select 1 of them , rigtclick and choose Edit LigthWorks material, click on the green Arrow on the top ( rerender ), when that is finish, Select the Group/ Category, rigthclick and Select Rebuild Thumsnail for all Group/ Category, when it is finish click apply Down in rigth corner, then ok out of the meny, now you should see them in the palette.
Then in TC database section, rigthclick an click on Save materials, give it a name as name.mat and you will have it in your system, and can reload it if you need later for whatever reason.
V18, V19, V20, V21, 2015 Pro. Platinum
Deluxe V20, V21, 2015
Windows 10 Home Premium 64 bit, 32 GB
NVIDIA Geforce GTX 780m, 1 GB