Sky Drive Downloading Progress – appears to have frozen with no change in progress yet individual files annoted as ‘completed’

I have been synchronising files to/from Sky Drive with two laptops. One is new and had 36,000 files to download. I have tracked the progress which appears to have frozen with 271 files still to download. However each of the files concerned is annoted as 'completed'. On the other laptop I have the same issue with both 4 files to upload and 87 to download - progress has frozen and yet they are annoted as 'completed'. What does this mean? Is something going on in the background that I am not aware of - ie is Sky Drive still synchronising?

Also can you advise the meaning of the icons in the bottom right of the (blue) folders on Sky Drive. Specifically what does the clock icon mean? I assume that the icon with the cloud and PC means fully synchronised and the arrows mean synchronisation in progress???