After accumulating enough items in the Borg inavsion Area to start crafting with them, i went to the crafting area and was unable to use my itms to craft anything. The poups show that I have all the items I need to craft any item that is available and the Crafting Recipes come up to display the available items. However, when I click on one and hit Buy, nothing happens. It makes the two hours it takes to complete the set of missions a total waste of time.
I'm a little confused by your post. What crafting area did you go to? AFAIK there is no crafting area for Defera. If you look in the drop-down menu on the mini-map it will only tell you what materials are required. To actually craft you have to be at Memory Alpha and used the workstation there.
You may also not have enough crafting XP. If you haven't crafted much then you won't be able to craft higher end items even if you have the materials for it. You'll need to level up first.