Idea: Prompt the user to find a missing macro instead of the current UX of a question mark icon.
Issue: When a macro referenced in a workflow is missing, then there is no way to a) know what the name of the macro was (assuming you were lazy like me and didn't document with a comment) and b) find the macro so you can get back to business.
When this happens to me know, I have to go to the XML view and search for macros and then cycle through them until I find the one that's missing. Then I have to either copy the macro back into that location or manually edit the workflow XML. Not cool man.
Solution: When a macro is missing, the image below at the right should be shown. In the properties window, a file browse tool should allow the user to find the macro.