[3dsmax] Biped doesnt care about my character's feet :(

[traBBit]

This is a weird problem and happens occasionally: After I've added a biped skeleton to my model and fixed all the envelopes and such, suddenly the character's feet are completely messed up. I mean, when I've done the bone-system ready and tested it, everything works just great (yes, the legs and feet too) but after few minutes the feet arent working anymore: the bottom part of the feet are sticked to the ground and wont move even if I moved to bones. So what causes this? I'm sure the problem is me but I just cant find out what I did to make this happen... I didnt touch the feet at all and yet all the sudden they arent working anymore.

Any advice?

[traBBit]

And yes, I've checked the envelopes: they do include the bottom part of the feet. I just doesnt seem to affect anyhow, like the feet were completely ignored by to biped :(

[BackLash122]

check if you didn't turn on that "foot holder" thing... the one that holds down the foot for walking animation... maybe?

[traBBit]

Hmmh, i didnt find that option from the menus... :/

[traBBit]

Well, i guess i'll have to do the envelopes again

[traBBit]

New problem: I've selected the whole biped but i cant use that "footsteps" mode coz it is in grey. What should i do? :<