Thunderbird (3.1.2) quits (crashes) unexpectedly SOLVED: caused by Cloudmark DesktopOne

Thunderbird 3.1.2: "Unified Folders" view: I right-click a folder under the Inbox node and select Properties. This displays the "Folder Properties" dialog. I click the close button (top right of dialog) and Thunderbird quits completely. Looks like a bug!
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