I have been having a problem with, but it is not the same as you. I'm adding the information about here since this thread is open.

Specifically whenever I try to manually "Check for product updates" by clicking on the "Check for Update" button under Preference a dialog box titled "Update Progress" appears but says "Error: Unable to connect to update server". Before that another dialog titled "Check for Update" appears very briefly saying "Connecting to http://update.zonelabs.com/checkupdate.asp:80 ..."

This use to work when I have version installed.

Anyone else having this problem -- any solutions out there?

I'm consider downgrading to to see if it works any better. That's the latest version mentioned on their Release History page...