Skydrive Can’t Upload docx or xlsx files

Hello. I'm running Windows 8, Office 2013, and the Skydrive desktop app. I am completely unable to upload any Office files whatsoever. I've tried opening Word, creating a test document and saving directly to SkyDrive from within word. When I do it that way, I see the "Uploading to Skydrive" progress bar in the bottom right corner for about 10 seconds, then it says "Upload Failed. We're sorry this didn't work. Try saving again later and if that still doesn't work, click "Save a Copy". Out of desperation, I saved the file to my desktop, then opened my SkyDrive folder from the desktop application (I've also tried opening it directly from Windows Explorer as well). I dragged the file into my SkyDrive folder, which started the synchronization process. Unfortunately, the process failed again. A balloon message popped up from the system tray and said "Failed to Upload File". The only way I can get a docx or xlsx file into skydrive is by opening the skydrive website and uploading it through the site. The odd thing is that all other file types work. When I drag in photos or text files or any other kind of file, it uploads successfully. This issue has been happening for the last three weeks. I've been patiently waiting and trying again because I thought it might be an intermittent problem that would resolve itself (it started happening right around the same time that Microsoft was having trouble with its Hotmail/LiveMail sync), but no such luck. Any ideas? Thanks in advance!