I have a screen shot how do I post it

I'm not using the catalyst on it I have tried so many items and none of them will give me arcane shards

What do you mean it cant be the item from Griswald in Tristram is that the wrong Catalyst

I have tried to put an unique item in the cube with the catalyst of disenchantment, but it still does not work. I have no ideal why its not.

OK well I'm having trouble using the cube to get arcane shards any help would be great