I got the error message "The sandboxed solution could not be activated" when publishing an new empty infopath form with the default autogenerated c# code.
The Sharepoint 2010 User Code Host Running service is shown as started in the Windows Server console
The Sandboxed Code Service is Started in the Central Admin.
I can publish a form without code with no problems, and I also published with sucess a workflow .wsp as a solution amd activated it on the server.
There is no DC on the server.
Anyone have a clue on what could go wrong ?