This issue is known, intermittent and dependent on a number of factors. It has been addressed and an update is forthcoming.
This type of issue would be identical across NVIDIA based ARM PCs and large numbers of the reference platforms were available at the same time they have been available to external developers.
Developers on the Office team (and Word team) that needed to contribute to the ARM focused work had access to the tools and hardware needed, including Surface specific hardware. There was no shortage of knowledge, hardware, or communication.
Steve, when will you update the image that ships on Surface RT devices? I had to download around 600MB of Windows Updates on day one before Office was in it's final usable state. Once updated though, Office is great - I didn't realize Word had a blogging client built in that rivals Windows Live Writer!
Thanks, sir. I really appreciate this, and I'm about to frame it. I've been so frustrated after being vilified by folks for even suggesting that there's a problem. (sigh) Thanks for commenting here where the action is - that's really awesome.
Off topic comment.
Just tried the surface RT at the Microsoft store today. I think its awesome. I am considering the surface PRO for purchase. However, I am concerned that I cannot use it as a "laptop" i.e. balance the surface while typing with the keyboard on my lap. This is probably 50% of my usage scenario. If there is a heavier version of typecover that can support the tablet without a kickstand when placed on the lap I would rush out to buy the Pro version.
I can type on my lap with touch cover just fine. Not quite as fast as when on a desk but I think that is true (for me) even with normal laptops. I think it just has to do with the angle that your arms/hands are in.
I was also a little skeptical but I was pleasantly surprised by how natural and easy it felt.