Can you post a sanitized copy of the step in question, or simply email it
support@kinook.com to better see what is occuring?
Easiest way is to make a copy of the step, replace any sensitive info in this copy (user names, passwords, paths), then copy this revised step (to the clipboard). Finally, paste into the post or reply email, an XML fragment of the step will be pasted which anyone can use to reconstitute the step in Visual Build Professional.
Note: You can supply any necessary macros using the same copy/paste technique.