Uploading files (pdf, jpg or mp3) via the webinterface (my.pogoplug.com) doesn't work anymore. The progress bar shows the upload progress and when done the popup box is closed. But after the folder reloads it is empty or sometimes just a few of the selected files show up in the folder. 

After some testing I think this mostly happens with small files (< 50KB). If I upload a pdf file that is < 50 KB (small pdf file with only text) then the file is not uploaded or it disappears after a reload of the folder. The file size is incorrectly shown as 0 KB. A pdf file that is approx 300 KB uploads just fine and shows up after the upload.

I did the 'error-checking' on all drives but no errors where found. 

Any tips?