Comex has asserted their right ["right"? - yeah, right] under their rules to deliver the equivalent paper interest in Exchange Traded Funds such as GLD in lieu of the delivery of physical bullion for those standing for delivery under the rules of the commodity exchange.

"...it appears that a lot of investors believe and trust that investing in GLD is the same thing as buying physical gold bullion. A close reading and analysis of the GLD Prospectus, however, reveals that investing in GLD is drastically different from owning gold. This analysis will show why GLD is nothing more than another form of a derivative security which is loaded with counter-party default risk."

Owning GLD Can Be Hazardous to Your Wealth

Even Gartman doesn't like it:

"To finish, we do agree that recent decisions to allow for the "delivery" of ETF shares in the stead of actual physical gold against a futures position does cause us some concern. Indeed, it causes us some very real concern, for if we stand for delivery of wheat we expect to receive wheat, not paper. The same holds true for delivery processes on the COMEX, and if GATA and the "Bugs" have a complaint it is this new decision by the COMEX. On this, we’ll grant that the "Bugs" have something to complain about." Dennis Gartman in The Gartman Letter