Font Manager Can't See Folder Contents

I've just installed Corel 2017 and for some reason, the font manager is showing no fonts in a chosen folder. I've tried moving the folder to various places and changing the number of fint in there, but still nothing. I've attached a screenshot. You can see the folder has over 2000 fonts in it, but Font Manager only shows 400. If I tick the Not Installed filter, it shows zero. Anyone else had this issue?