Well THIS is still a problem in the Gallery.
Comes up with this error message, when none of it applies: "There was an error posting your image. Check the size and make sure it's not overly large (e.g. 1.2Mb or more). Also, make sure it is the correct file type. Many times, a file may say ".jpg" when it is some proprietary file type from your camera or software incorrectly saved with the "jpg" extension. To be sure, just open the file in a program and when you save the file make sure you are saving it in jpg format."