We had an issue earlier this morning that has been resolved now.
Please try again to see if this issue actually was the cause of your problem.
Issue is explained here:
www.joomlapolis.com/component/option,com_joomlaboard/Itemid,38/func,view/catid,110/id,142002/#142002
Please note that we have been working towards a new approach that will be included in CBSubs 1.1 (currently in RC3 phase and will be released very soon) and this will immunize installations against similar license server issues.
Thank you for your patience.