Checking for Errors
When you open a workflow that contains errors or when you select File > Check For Errors, the Workflow Designer checks for any and all errors that could prevent the workflow from executing. First it checks that all of the workflow properties are set and valid. Then it checks each step to verify that all properties are valid. A message box lists the errors and red questions marks are used to guide you to the problems in specific property dialogs.
For example, if you import a workflow that specifies a workflow control property that does not exist for the current server configuration, it places a red question mark on the Form Options tab of the Edit Step dialog box.
Specific fields display question marks when they are in error in the Workflow Properties dialog. The Edit Step dialog box displays question marks on individual tabs as well as specific fields.