Welcome to WebmasterWorld Guest from 220.127.116.11
On a search today (for two different 2-keyword combinations), I had the same URL show up, once as a supplemental and another time as not a supplemental.
I always thought supplemental applied to the URL, or have I been wrong all this time?
Does that apply in your situation?
The "similar pages" option off of the search result shows 31 similar (almost all different domains except for our home page)
Maybe the cache was/is being updated?
I'll keep trying, but it looks like I can't find the URL as a supplemental result any more.
.. and thanks, tedster, for the link / reminder about the thread on supplementals.