When using the refresh button (F5), the web ui's browse filesystem page acts strangely if files are modified.
1. Create a few files in Tachyon (same level directory)
2. View the files in the web UI
3. Create some more files in the same directory
4. Press Refresh
What may happen is some of the files get replaced by other files, but not all the files will be there unless the user manually clicks on the Browse File System tab in the nav bar.