adobe audition 1.5 not recording

I've purchased and downloaded adobe audition 1.5 on my computer. It's been working great. But this morning when I went to record a new session, although the timer runs like it's recording it is not recording. Playback button won't work and the cursor won't move like it does when it's recording. It plays existing files without a problem. But even if I try to record over an existing file it won't do it. I'm guessing it's a settings issue but I don't know where to find that particular one. Please advise