Read through the following topic if you are experiencing Send Wizard availability issues in SugarCRM.
When you click Send Silverpop Email in Leads, Contacts or Campaign view, the Send Wizard doesnot appear or you receive an error message as Unable to show send wizard window!.
Resolving the problem
Your browser's pop-up blocker might be blocking the Send Wizard. Add your SugarCRM domain to your pop-up blocker's sites or exception list.