Remote files empty after saving

This has only happened to me with one file, that I know of. I edited an html file on a remote ftp host inside Flow to change one line. I saved the file, went to the website and it was great.

A couple weeks later, we've noticed the page is missing. I uploaded a backup inside flow, then edited one line using the Flow editor. The website is updated and it looks good. I go back to the website a minute later and the page is blank again. In Flow the file is now 0 bytes. This only happens with Flow, so it can't be the server, and I am the only one who should have access to the FTP server.

I really want to use flow because I love the UI but its so unstable. I was putting up with the crashes, but now I can't even rely on it to edit files. :(

I'm using the latest stable release, 1.0.3.1 (580)