After upgrading to v0.4 I got an error message on the plugins page saying that the sftp.php file could not be found and so the plugin had been deactivated.
However now the plugin doesn't show on the plugins page at all. WordPress recognises that the plugin is installed if you try and install it again. But its deactivated and I've no way of activating it if it doesn't appear on the plugins page.
I can't remember what the plugin file structure was like before, but now there are certainly no files in the root directory of the plugin so I'm wondering if there's a file missing in the root of the directory?