Ok i just got back to the game and still have 50 Revita-pop i was keeping them handy for when i got back so i could lvl faster and now there red and i cant click to use them whats up with that?
You can still use revita pops, but they are red (or grayed out) because you have 100% vitality bar. Wait until you start using up your vitality first, then they will be available to use. One per hour and they don't restore nearly as much vitality as you'd like.
Also, be aware that vitality seems to go very quickly in Lindvior. Maybe that's just my impression and not fact. :p