We had this same exact problem last year. My dogs had been getting their monthly Frontline treatments, so I was distraught when a flea would jump on me while I was sitting on my couch/whatever. My vet recommended we switch to Revolution. Nope. Then we tried Advantix. Nothing, over those trial months they just got worse. I would salt my carpets and vacuum EVERY DAY. We finally switched to Comfortis and that, combine with a couple weeks worth of constant cleaning finally got rid of them. When Spring arrived this year, I chewed off all of my nails anticipating the fleas that would come with it. So far, so good! Our vet tried to get us to switch back to Frontline, apparently they came up with a new formula since so many people reported it ineffective. Never again, ever!