The problem though is that sometimes when I make changes to files or create new files on one computer, these seem either not to sync at all on another computer or take a long time to do so. It seemed to work well at first but lately there have been problems, including having red X's on some of my files. And today for some reason, even though it says skydrive is 'up to date', the folder that includes the file changes seems to forever in a state of synchronization (blue arrows).

Pleas provide advice on how I can solve this problem and how to ensure effective synchronization in the future.