GrandCentral Issues: Click2Call Working?

Ok, now I can't get GrandCentral's Click2Call to originate calls at all:

• I select "Call."
• GC responds by displaying numbers from which I can call
• I choose one
• GC displays the indication that the call is happening
• but no ring at the number I've chosen to call from

Updated: Just tried calling and got through ok, so perhaps the function is working again (for me).