Actually I don't know if this is because of the guild augment or not but...

I had crafted (pre 10.1) blindness ward goggles of attack +4. They have a large guild augment slot.
The level was +5 (I thought it was higher, but it said +5 post 10.1 so guess I was wrong)
I could slot an augment.

Post 10.1 The level changed to +6, and it wouldn't let me slot a guild augment anymore.
I received an error message saying

(Standard): This recipe cannot be performed because the resulting item would surpass its current Maximum Enchantment Level.

Craft and use a Shard of Potential to increase the Max Enchantment Level first.
Crafting was shut down, so I couldn't try and fix it.

Tonight, went to add a +6 potential shard to the goggles, got an error message saying
(Standard): This recipe cannot be performed because the resulting item would surpass its current Maximum Enchantment Level.

Craft and use a Shard of Potential to increase the Max Enchantment Level first.
Figured they changed something so I couldn't add potential +6 on a potential +5 item with stuff already crafted on it, so grumbled to myself and went to disjunct the goggles, received a message saying (you guessed it)
(Standard): This recipe cannot be performed because the resulting item would surpass its current Maximum Enchantment Level.

Craft and use a Shard of Potential to increase the Max Enchantment Level first.
So I can't use the augment, I can't upgrade them,and I can't disjunct them.
This seems like it is not WAI.

Bug report filed, but anyone else see anything like this?