Just a Second ago nearly all of the People Tags of Photo Gallery disappeared.

I think it is a syncing issue with skydrive? i used my ultrabook to tag people on Pictures i took on hollyday, and when i came back and turned on the Photo Gallery of my Desktop, only the People i Tagged with my Ultrabook the last days where there. Also, "marked" pictures are almost all gone, but i cant understand, which are left and which are gone.  

(I lost a ton of work if there would be no way back)