Minecraft Forums

Okay, so i have a single player survival world that i am on 24/7 and it had quite a few mods. so i was trying to see if i could switch versions and still have forge, which of course didn't work out. anyway i switched and the little mods thingy wasn't there any more and so i switched back. and when i got on 1.6.2 [i tried to get on 1.5.2], Forge and all the mods that i had were gone. the mods are still in their folder and everything is still in its place and all. but it doesn't appear when i get on. i made sure i was on the Forge profile, and made sure i was on the right update. but it is all gone!. i just want to know how i can fix my problem so please help.