Hi Kathy,
Some users are having trouble uploading images. We've been looking into it, but it's been hard to debug because it's only happening to some users and the uploads seem to be failing before the data reaches our server.
If you'd like, you can email any additional information (such as the image file, what page you were on when you were trying to upload, what time you tried to upload, who your internet service provider is, etc.) to jamie [at] wikitree.com.