It wont let me queue for heroic dungeons even though I'm GS 4.8K
I just came out of a random heroic dungeon and tried to search for another one only to be greeted by "you do not meet the requirements for this dungeon".
Now I can't queue for any heroic dungeons even though I was able to in the past. I did not make any changes to my gear.
As far as I know, RHC measures average iLvl not GS (although i forgot minimum ilvl).
1.) Maybe there's an item with a very low ilvl that drags your average ilvl below minimum.
2.) Maybe you have an heirloom. Heirlooms contribute to gear score but have a 0 ilvl.