The issue has now been resolved, and an updated version of the KVS Tool (V5.4.6) is available for download.
Thanks for such a quick turnaround. It works now, but I have noticed that many AS availability is not showing up. Tried many dates/routes such as SEA->YVR/SFO/LAX during middle Feb, 2011, in most cases, I got either empty availability or at most some YM (is YS all gone suddently? I saw a bunch last night)
Thanks again