Since the last update I have been having this problem with Webdrive connected to my Office365 sharepoint.
I edit a document, say in Word, and then click save. Word goes through the save procedure, and everything looks normal. However, when I open the document later, I find that no changes were applied to the document. In fact, going to the sharepoint portal, I can see through version history that the server did not receive any of the recent changes, even though they were saved.
Could you look into this, as otherwise I cannot trust Webdrive with my files