Cuando actualize la aplicacion ( la segunda version desarrollada bajo vs 2005), pareciera no leer el web.config. Lo unico que muestra es:
It is an error to use a section registered as allowDefinition='MachineToApplication' beyond application level. This error can be caused by a virtual directory not being configured as an application in IIS.C:\Documents and Settings\marcbil\Configuraciónlocal\Temp\VWDWebCache\www.marcbil\WebSite2\Web.Config