Rawr! Shu must be one of those sg males that either fake medical condition/s for exemption or simply born too wealthy so he can pay for it. -20 respect points! jks
Anyway, back to topic.
The following is taken from
http://www.incgamers.com.With StarCraft 2 being so heavily integrated with Battle.Net, gamers
who purchased the game are becoming frustrated with the way in which the
game stores single player progress when logged into Battle.Net.
Currently gamers are losing achievements and save game progress which
has only just come to light as more and more gamers progress in the
single player campaign.
As players have progressed through the campaign, unbeknown to them,
they have been disconnected from Battle.Net while playing, or their PC
may have crashed. However, although the game saves locally to the hard
drive, the information is also sent to Battle.Net which stores the save
progress and achievements, and if connection is lost to Battle.net, the
save and achievement information is also lost.
With no message to say you have been disconnected from Battle.Net
while playing the single player game, some gamers have lost hours of
gameplay time only having to go back and redo missions.
RTS gamers will remember the problem with
Command and Conquer 4 losing
mission progression when connection was lost to EA's server, and while
there was a workaround eventually, this caused huge headaches and made
the single player game irritating to play if the connection was lost.
Blizzard has not yet posted a solution to this on their
support forums.