Materials libraries in nXt missing

I have recently upgraded to Rhino 5 and Flamingo nXt. However it seems that the materials libraries have become corrupted.
The flamingo materials folder on the control panel are all empty except for ‘Textures’ folder. Any of the other materials folders when opened lead me to open the bare bones of the Rhino 4 interface. Although I upgraded in Windows 7 professional and am now working in Windows 10, the problem was apparent in Windows 7 from the start. Is there a way to load the materials back to their relevant folders and open them in Rhino 5?