I believe that unless its your opponent's move in all of your games you can't turn vacation on.
One of my two timeouts is for this very reason. I don't recall getting an overt error message, although I may have just missed it in the hectic pre-vacation flurry.
This may be what happened with your situation.
Um... I want to know how to put my status to vacation because a few weeks ago I tried to put on vacation so I can do some reviewing for the exam, not studying, reviewing. So I went to setting and placed vacation for about 2 weeks.
I didn't trust myself or the system so I log in and took a peek after 2 days just to make sure... I saw all my games are going to run out of time in... less than 10 hours... I used my intense speed to finish the moves... about 30 games that is... and some people are online so they keep moving making me breathless...
I don't want something like that to happen ever again... so can someone tell me how to set vacations? (I limited my games now just to make sure I will have enought time, lolz)