I exchanged dialog with them ... here's their response:
Today we encountered a problem with the PokerStars site and are in the
process of restarting our servers.
If you were in a tournament at the time of the outage then we will be
cancelling the tournaments. These tournaments will be cancelled in
accordance with our Tournament Cancellation Policy which can be found
Poker Tournament Cancellations - Rules and Policies
Any players who were in a tournament will receive an automated email
with a full breakdown of the refund issued, after the site comes back
If you were involved in a cash game then your chips may still be
allocated at the table(s) you were playing at. You can locate the
tables by using the Requests -> Find a Player feature, and searching
for your own UserID.
We apologize for any inconvenience caused by this incident which I
assure you is a very rare occurrence on PokerStars.