Equipping Gear Sets is Broken

Hi there! I couldn't find anything on this, so hopefully I'm not double posting.

I have been playing this afternoon and decided to do some crafting, which I haven't done in a few weeks. I was able to switch from my regular gear set to weaving just fine. But when I tried to switch to leather working, it said "Unable to equip [...] Insufficient armory space". I though it had put whatever I just made into my armory chest and blocked it, but it didn't. I didn't have any space in any of my main gear slots, but since it was just switching out, it seemed fine. I could switch between monk and weaving and alchemy with no problems. But when I try to switch to Leatherworking or Woodworking, it gives this error. I also tried freeing up the space, so that each slot has at least one open space in my armory chest, but even so it is still giving the same error of not enough armory space.

*Just tried again to see about other classes and it changed. I have them set in my hot bar, so I tried monk, then WHM, then Conjurer, then lancer, then Alchemy (which didn't work this time - same error) and then leather working which *did* work this time.

So weird, but I don't know what's going on, as I haven't changed my inventory at all, just switching through already used gear sets.

Time: 2pm PST 9/9/15
Frequency: Thought it was 100%, but as mentioned, it changed a bit
World name: Faerie
Character name: Raine Reorh
NPC name:
Monster name:
Class/Level:
Party or solo: Party - just me and my 'bo
In-game time:
Area and coordinates: Uldah markets
Steps:
1. Just using my hot bar gear set buttons.
2. Same issue if I try to change gear sets from my character window too.

Oh, I'm playing on a Windows 8.1 on a desktop PC

Let me know if you need any other info.
~Raine

Do you have two open ring slots? That's usually the culprit. You need to have two open ring slots to change gear sets, even if they share a common ring.