Echo in Podcast

I cannot believe using Audition should be this difficult.  Thousands of people use Audition to create Podcasts. I have been at this for hours with no success,

I just cannot believe this program is this big an pain in the butt.

But now it's worse.

My initial sound test worked fine.  Then I did something--I genuinely no idea what--and now all my recordings have an echo. It's as if I am recording on two microphones.

I went into Windows to make sure I was recording on the Rode mic and not the internal mic.  I was.

I went into Audition to make sure my input was, again, the Rode mic. It was.

Short of rebooting, I have redone every step and the echo is still there.

Any help on this issue?  I cannot  believe I am the only person who has encountered this problem.

Thanks in advance to anyone or ones who can solve this mystery.