Does not render code / endcode blocks

[hcw70]

When having in a C++ file:

namespace IODriver
{
    /** Class used to add a generic logging layer to all drivers and plugins
     * Example:
     * @code
     *      <extensions>
     *      </extensions>
     * @endcode
     * Additionally channelId, messageId and messageName is supported.
     */
    class IOMessageLogging : public QObject
    {
    }
}

the part within code / endcode is left out completely.