First... I would suggest you get a friend to go in a low level dungeon with you so you can "experiment" without loosing important loot or getting a raft of crap from the other people in the dungeon.
That said, disable every addon except nUI -- including disabling any nUI plugins you have installed -- and see if the loot window works. That will at least eliminate the chance that it is a conflict with another addon. If it works, then we need to figure out what addon you have that's interfering with it.
If it doesn't work, then we need to figure out why it doesn't work on your system... so get a loot roll window to come up with your friend, and then use '/nui movers' to unlock the mover system and start moving all of the windows around your screen... see if the loot roll window "follows" any of the other windows around... suddenly appearing on the screen. You can right click and window you moved to return it to the default location. Use '/nui movers' a second time to lock everything down when you're done.
If you still couldn't find the loot-roll window, try using the command '/nui minimap' and get another loot window to come up... see if you get the roll window then.
If you still don't have it at that point, I'm utterly stumped.
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