If you update your computer to the new system Maverick, you may have to Re install the driver for your License key, whether is a Wibu or a Codemeter.
If you experience an error message ‘no license found’ you can download the drivers from Graphisoft’s website:
http://www.graphisoft.com/downloads/protection_key.html
For more information:
http://archicadwiki.com/OsxMavericks