skydrive has stopped working on Mac /Windows 8

Skydrive has been working fine since launched on this new mac - a few weeks back it stopped syncing even if i just put one small photo ( i normally sync large video file ). No idea why it should have stopped. I have put on the very latest versions on my macs and pc's - they are all running the latest Os'es but still don't sync. My credentials are ok as I can use the web interface to sync files.