It's actually a known blizz bug for 64 bit OS systems since the patch. Blizzard are asking for more information if people have any to help them to track down the main cause. 56 pages at least from my just looking now.
http://forums.worldofwarcraft.com/th...52505632&sid=1
Out of Storage error / 3.3.5
We'd like to thank everyone for pointing out this problem to us. We've collected a lot of info already and passed it on to be investigated. From what we've seen, it's related to a 64 bit OS and higher than usual memory usage. Please post here if you have any additional, pertinent info to add. Please do not post "me too" threads as they're of no help at this time.
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The fact that you're using nUI just exacerbates the existing problem rather than being the cause. You have the existing memory problem that they are trying to track down with nUI's extensive operations eating up more which means you hit that limit sooner with nUI than with most other addons.