Rumor on the YES lists is that Squire had a blood clot in his leg. Here's the official announcement from YESWorld:
YESWORLD: The Yes Online Service
UPDATE: February 18, 2009
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"IN THE PRESENT" TOUR CANCELLED
The "In The Present Tour", featuring Yes' Steve Howe, Chris Squire,
and Alan White, is cancelling the remaining scheduled shows.
Founding Yes member, Chris Squire, underwent surgery on his leg on
February 11, 2009. The operation was successful and Chris is on his
way to a full recovery.
However, Chris has been advised by his physician that he needs a one
month rest period, hence the reason for the cancellation of the rest
of the tour dates.
As previously stated, Chris and the rest of the band wishes to
apologize for any inconvenience that this might have caused to their
fans and hopes to see them again soon.
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YesWorld
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http://yesworld.com/lists/lt.php?id=...RKUQQFUA%3D%3D
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webmaster@yesworld.com <mailto:webmaster@yesworld.com>