Remote file deletion leaves ghost filename

If you upload an image from the iPad to U1, and then you delete the image from U1 using a different computer (Running Ubuntu 11.04) the file name remains on the iPad.

If you try to view the file on the iPad it shows a blank image. Trying to delete the file does nothing (the file name remains).

Similarly, a file added to an existing U1 folder remotely does not appear on the iPad - only the original folder files appear.

It behaves as if the directory list is not being refreshed. (Swiping down says "Loading" - but it does not refresh.)