But it soon began shaking due to a gas leak from a thruster, and that
continued through Tuesday, the Japan Aerospace Exploration Agency, or
JAXA, said on its Web site."

Hmm. Sky&Telescope makes it sound like it is not such a big deal
(maybe):

Today's sampling operation went smoothly, say officials of the Japan
Aerospace Exploration Agency, though after leaving the surface a
thruster problem arose that forced ground controllers to place the
craft in a "safe" (standby) mode. "Actually we were seeing the sign of
this problem during the descent phase," notes project manager
Junichiro Kawaguchi. "But at that time we switched to the backup
system and continued the descent."

According to Kawaguchi, the problem caused some loss of propellant,
which was already in short supply, and probably involves one or two
malfunctioning thrusters. Operations continue normally for now, he
said, though the propellant loss has "definitely raised the bar" for
getting Hayabusa back to Earth.

http://skyandtelescope.com/news/article_1630_1.asp