Responder ao suporte do TextWrangler:
Though TextWrangler 5 (like previous versions) does list open documents in alphabetical order by default, the order of reopened files right after a version upgrade may be arbitrary as a one-time outcome.
You can however correct this situation as follows:
Create a new editing window (File -> New -> Text Window) and then drag all open documents into that window's file list, where TextWrangler should sort them in alpha order (as usual).