No longer accepting files


Firstly I have been using smart ftp for about a year now and have had no problems!

As usual i am dragging and dropping files into the relevent folder in smart ftp browser.

As of today, when i drop a file in the window, the screen flashes, as it would on a small-sized upload, only nothing is being uploaded.

The files simply don't upload, with no error message or explanation.

In fact in the connection window it flashes 'uploading' for a moment before disappearing, with no result.

Any ideas anyone? Any help would be massively appreciated.