I have upgraded icloud to 20gb and have been using with no problem until April 26. Now nothing is getting uploaded to the cloud. It will show a progress bar but shows no progress in upload. My account shows active on all my apple products

I have been using iCloud's 20gb upgraded storage for several months with no problem. But since April 26, 2015 none of my files are uploading to the cloud. In my iCloud drive folder new files (pages and keynote) show a cloud silhouette and a progress bar, only there never is any progress. I am using a Macbook Pro with OS X Yosemite version 10.10.3, my ipad and iphone are using version 8.3. All of these show icloud active, and no changes were made just before April 26. Anyone have any suggestions?