unable to answer received phone calls

[Kevin Williams2]

Hi fellas, as the title says I am unable to answer whenever someone calls me, this is from when android updated itself from ICS to Jellybean 4,2,1, it's getting frustrating waiting for the caller to hang up so I can call back. Anyideas, any setting I may have missed, need to get full functionality back for work purposes. phones stock, not rooted. and about 8 months old. thanks