If I click to check out a document, and choose to keep a copy of the file in the current workspace, then click Check out.
I get the "Edit working file now" I click the link to save the document, and click on OK to say it has been downloaded.
The document then opens, I make the required changes…save the document, go back to Alfresco, and click on check in document on the working copy. This disappears, and the timestamp for the original one is updated.
However, when I open the new document, the changes I have made do not appear, and Alfresco shows me the original file.