I cleaned the line and it tastes fine, last night anyway.
I've had this happen before, and it only usually happens with IPA. I was talking to a bar owner and he mentioned something about if certain IPAs sit for very long in the line he has to flush the line with 1/2 a pint before he can get it to taste right. Anyone else ever hear about this? I wonder if the hops in the line affect the line someway.