When trying to upload media into a post (WP 3.5) the progress bar seems to go to 100%, then there is a pause, then I get an error message "An error occurred in the upload. Please try again later" although the picture does show in the media library. The image does not get added to the post because their is no insert option (that dialog box is replaced by the upload error message.)
If I then goto the WP media library I can see the image and click on the title to bring up the image page. If I then click on "Edit Image" (the WP edit image button, not the Scissors edit image button) the image is not displayed and instead I get an error message "Image data does not exist. Please re-upload the image."
Any idea what's going on? If I simply disable scissors everything (upload, insert, edit) seem to work just fine.