It's definately NO fail as it's working perfectly for my whole guild, me and several other thousands :-)
Try the following:
-Logout and close the game!
-Go to c:\users\you windows username\documents\elder scrolös online\live
(or liveeu if you pla on the european server)
-Delete the following filename: ShaderCache.cooked
-Switch to subfolder SavedVariables
-Delete filename GreymindQuickSlotBar.lua
Afterwards login again and setup the settings of Greymind again.
If the icons still don't show it's something related to your local pc I guess.
Or the settings. But with the standard settings everything should work correct.
Oh: Don't forget to press I to open the inventory, switch to the quickslot ring and drag&drop potions, food, etc. to the quickslots. Without them filled you are not able to see anything
Btw: If you want to have the quickslots changed upon some events (in combat, in pve, in pvp, in delve, in dungeon, food buff not active, etc.) try out my addon:
FCOStarveStop or another one (just handling food buff):
OmNomNom