Well it started after i made the display cases for the armory and i tried to put Wuthrad in one.but it wouldent let me put it in.instead of activateing it,it only said open or close.this happens with every weapon i try to put in.can someone please help??

You have to drop the item on the ground, then pick it up by holding the A button and manually place it in the case.

It could still be simpler than that. I tried this and most of the weapons would not stay.

Fine drop them on the ground, leave the building, come back and then manually place them in the case. Something too big for the case is still not going to fit, although sometimes you can get it in on an angle.

Same here, except no cases work for me

Well they want unless you pick the object up and put it in there, you are having trouble reading? It was already mentioned how to manually put objects in the display cases, and that is hardly a new thing. All the cases work just fine, although save before putting any unique swords in them, if they fall through on your return you might permanently ruin you chance of getting them to sit properly in a display rack or on a weapon plaque. The only solution is to reload the save game.

I've put stuff in the display cases. But when I come back they are either on the floor or above the glass on the display case. Maybe I'm putting the stuff in wrong

I loaded up a case with a bunch of gems, about a 100, it looked so cool. Then I left the house, remembered I needed something, came back, and all my gems were on top of the display case. And, of course in trying to pick them up, I triggered the case lid to open which scattered the jewels all over the house. I just reloaded to before I even put the jewels in.

I don't use the display cases anymore.

I did not drop them on the ground first, not doing that with 100 gems.

I tried a few gems in display cases, not a lot of them. One of those wooden trays is best for gems, like the one on the floor in the entryway near the main hall door. You can try them in a small bowl sitting on something, but defying the laws of gravity the bowl will tip over as you put them in unless you are careful. One of the more flat bottomed silver bowls is best to try out for that. in Oblivion we could just put them on a plate, but in Skyrim they will escape and go everywhere but the plate when you return.

I put my gems in the display case (and in just about everything else) by directly dropping them where I want them. I will just line it up and pick up the mistakes till I get it right. They always stick.

I have built two houses and none of the display cases work. Yes I have read you can drop things on the floor. I am able to activate my dispay cases in my old house at Solitude so I am presuming it's a bug with the new homes I hope it gets fixed soon as it really is a waste of time building an Armoury if you need to fart around dragging and dropping stuff rather than the case activating.