ATP not working

Hi,

we have set a ATP for one of the channel and it was working fine..we were asked to change the timings, so i just chnaged the timing and saved it.

since then the channel has not picked any data...i didnt make any other changes...and i have done this before also and it was working fine..

any idea, what could have happend? i am afraid of starting the channel manually as it works on a particular timings and that is why we have activated ATP setting for it.

please