Any ideas of why one can no longer book reward travel to Asia on continental.com on Northwest metal (as of the last week or so?)

I've tried lots of combinations including Continental hubs but they are not showing up anymore (i.e. to NRT, SIN, etc).

However, booking a flight to Guam (or other Micronesia) via NRT on Northwest metal only is doable.

I seem to get one of three kinds of messages. Either:
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Seattle, WA (SEA) (or other USA city) is not currently served by Continental or its partners. Service begins Fri., Mar. 2, 2007. Please modify your search criteria. See the timetable for our complete flight schedule.

-- When changing dates or cities, I get other errors.
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Continental or its partners offers service between Seattle, WA (SEA) and Singapore, Singapore (SIN) on Sundays, Mondays, Thursdays, Fridays. Please modify your search criteria.

-- Set to correct dates and it doesn't work.
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Continental.com could not find any available flights for reward travel meeting your requirements