I upgraded to SP1 and got the message "Cannot insert duplicate key row in object 'sitefinitysteve.sf_schema_vrsns' with unique index 'idx_sf_schema_vrsns'." and after that "The system is restarting..."
I then took an older backup (with and older database that runs fine from Project Manager), and upgraded that to SP1 using Project Manager. Now I get:
"The current type, Telerik.Sitefinity.Abstractions.VirtualPath.IVirtualFileResolver, is an interface and cannot be constructed."
I have no idea where to do next. Someone can help?