Soren,
1. Based on our discussion on other customer tickets, there was an issue related to this that is tied to the transmitconfiguration settings in the editor. For the other case, they had to change the connection from AngelLite to Angel then it will work.
2. Did you try uninstalling the client and go to the directory of where the client is installed and make sure you completely cleared the directory. The uninstall feature does not remove the data automatically, you need to manually remove it.
also make sure to copy the certificate from SMP 3.0 to the client and install it as needed. Make sure it also exist on the directory where you installed the Agentry client. In past tickets, if the certificate does not exist in the same directory, the system or Agentry client will not transmit or it may crash.
Regards,
SAP Mobile Support Team