I have a lovely display of Daedric artefacts in the basement of my house in Solitude. Irritatingly, the Ebony Blade refuses to be held by any weapon rack (whether wall mounted or free standing). It is unequipped successfully but then falls onto the floor rather than being attached to the mount.
I had thought that this was just a sign that two handed weapons can't be mounted, however there were iron greatswords pre-supplied in them and further research has revealed that this is a known bug with the Ebony Blade. Has anyone found a method of mounting the ebony blade?
Best Answer
According to TES wiki:
I know when I tried to place mine in a weapons case it disappeared and I had to leave and re-enter my home multiple times for it to regenerate on the floor. So I re-emphasize, be careful. Best option is to put it in a chest, though I know its pretty and you want to show it off.
Source: http://elderscrolls.wikia.com/wiki/Ebony_Blade_(Skyrim)
(Once on page - scroll to bugs, this is main bullet point 7 on the list for the weapon.)