Hi Bill,
That sounds right - the Symbol Wizard is only available in documents based on the Block Schematic template. Technically, the way that this is done is by the use of an attribute (Name: "Environment", Value: "Block Schematic") in the Block Schematic template.
If Environment=Block Schematic the Symbol Wizard will be available. If the Environment attribute does not exist, or has some other value, the Symbol Wizard will be disabled.
If you have broken the Block schematic template, a quick fix would be to rename it, or delete it, then perform a LiveUpdate - this will install a new default template file.