Record button missing

I recorded a live concert last weekend, encountered a problem with WL8, so dropped back to WL6 which saved the day. When I first opened WL6, all worked as expected. But, after a reboot, I found that when I opened the record dialog box, the red button that you click with your mouse was missing.

Fortunately, I opened up the help file and found that I could press the * key to start recording, and that saved the session.

What might be the problem here?

Thanks for any advice.