i used Eclipse "Juno" for more than 3 years before upgrading to "Mars" which i have only been using for about 4 months... the upgrade is due to the fact that i'm now using windows 8, instead of windows XP (Microsoft forced my hand on that one!)
and i guess, that you need to setup your IDE settings properly! (lol)
hope that quenched your thirst!~cheers~
edit: i uploaded a momentary fix! it should be working now!