As I said, 
http://facstaff.unca.edu/mcmcclur/GoogleMaps/EncodePolyline/examplePolygons.html
works.  What's different about yours?

The example is available online, so strings can be pasted into
decoding utilities etc and otherwise inspected.
Yours aren't, the groups interface may have distorted them. I tried
reconstructing them, but the inner poly was just a squiggle not a
closed poly.  I guess that's just a mangling, but can't check your
actual string.
http://groups.google.com/group/Google-Maps-API/web/why-including-a-link-is-critical

The example has identical opacity etc. for both polylines, yours
doesn't.

But I think this may be the root -
The example has the outer first, and 'winds' it clockwise.
The inner comes second, and is wound counterclockwise.
In yours, both wind the same way, clockwise.

Guru Mike has posted erudite things on winding and holes -
http://econym.org.uk/gmap/chrome.htm#winding

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