There is some interesting stuff that goes on "under the hood" sometimes. This looks like it may be related to an oddity in the memory-mapped IO handling of the US15w. If there was an actual problem in these areas, it would be VERY obvious as it would crash the system. Because you have X running, I believe you can safely ignore the warnings and operate in safety.
As a side note, you might want to take a look at the EMGD 1.0 release that is also now available as that implements a more efficient architecture for US15w (and future related products) and *may* have implemented this area in a more elegant way to avoid the issue all together. http://edc.intel.com/Software/Downloads/EMGD/
Hope this helps.