From Runesabre. The problem he is referring to was a bug that allowed people to delete vendors; the reversion was necessary to An Corp said dead vendors back to life.
As some of you have pointed out, Pacific and Baja have had issues afflicting them. We have been working diligently on these issues all day. We have applied fixes, but, the damage done can not be recovered without reverting the shards.
Very shortly, Pacific and Baja will be reverted to early morning of Nov 20th ( Saturday ).
We apologize for the trouble and interuptions these issues have caused all of you. Please note that due to the reversion, Pacific and Baja will not perform their regular morning maintenance. Please check our website for further announcements.