hibb wrote:
When you have a joint where neither edge of the drywall is a tapered
edge,

A butt joint

do you use joint tape?

Yes.

I always have a problem finishing those
joints off to look good. The combination of the tape and the joint
compound causes a bulge and the always causes me problems.

You might want to try these:
http://www.trimtexinc.com/installati...20Cutsheet.pdf