This thing happens to me pretty often but not all the time. I have no idea what is the pattern. I change something in page and build it. It come back successful but TWS reports that file has been changed outside of the editor and asks me to update it. When I say yes, update it, it changes the file with adding spaces on some places (see attachment).
Sometimes its completely harmlos like in the attached case but it happens sometimes that it breaks the page. For example, if it adds a space in the string for javascript method call.
