Could you try putting single quotes around your parameter. Does that work? If you are still having problems could you post the error message your receive.
Have put single quotes around the parameter and get this error:
Error with block "SQL Param Search" Database error An error occurred connecting to or querying the database. Invalid parameter index 1.
If I put a quote in the parameter and not in the SQL then I get:
Error with block "SQL Param Search" Database error An error occurred connecting to or querying the database. Invalid state, the Connection object is closed.