This problem may have more than one cause but my solution turned out to be deleting the URL reference to Catch that seemed to be associated with some of my notes. The line I'm talking about is in the upper left hand corner underneath "Click to set author . . ." in the Windows version. Once I deleted those the android version of Evernotes synced up with the Windows version. Needless to say, I moved my notes from Catch over to Evernote. I don't remember how I did it but (Copy and Paste?) but both Catch and Evernote use the same gmail account so that may be the issue and Catch very recently went out of business - the end of August I think, and that is about when I started having sync problems.