There is a refresh error when a user uploads multiple files on Mac OS 10.8.3 and Safari 6.0.4. After the user selected for example 5 files at the same time and click on the Upload button, you a screen showing only 2 files - http://screencast.com/t/gYiE76M0D The EnableAsyncUpload property of FileExplorer have to be set to "True".
Not reproducible - 2015.1.401 version.