Upload pending – one or two of my files never upload

I have been using skydrive between my laptop and desktop for almost a year and almost all of my pptx files sync perfectly but every once in a while there is one that says "We saved your changes and will upload them as soon as the current sync with the server completes" but they never upload.  Is the server really syncing still, or is this a false statement that I see only on these pending files?  99% of my other files are uploading/syncing just fine.