So I just loaded Energy's new rom today and was getting the same problem with the Slide 2 Answer: Whenever I slide to answer, it would never pick up. The slider would stay to the left and the phone would continue to ring

I think this is caused by trying to answer the phone to quickly. If I see the call coming in and let it ring for a few seconds this doesn't happen. But when I try to answer as soon as I see it coming thru and slide it gets this error...

I haven't tried it on this ROM, but I think that's the problem. I may just avoid using the slide and just hit the send button to answer.