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Twice now I've been unable to upgrade a piece of gear. I keep getting the 'insufficient material' error message, but I have all of the materials!
With two exotic comments in my possession I'm unable to upgrade any item that requires two exotic comments.
If I acquire a third exotic component I'll be able to upgrade the items and have one remaining component.
*This did not happen when I spent five components on upgrading a weapon. I had five exotic components and spent all of them on the upgrade.
So far its only happened when I have two components.