Something weird I noticed: files in my SkyDrive no longer had its changes synced in the past couple of days. The only thing I remembered doing was resizing the partition holding my SkyDrive folder with EaseUS Partition Master. Somewhere along the way, doing this messed up whatever component was tracking changes in my SkyDrive folder.
Only fix I've found that seemed to work was to move the SkyDrive folder to another location and back - after doing that I can see new files being synced.
I have to say that SkyDrive syncing in 8.1 is by far more responsive than the finicky desktop SkyDrive clients in Windows 8 and prior. Still though SkyDrive has a higher tendency to mess up syncing than say Dropbox.