Hi Maeve,
I am having the same problem. It seems to occur after I insert one image. Then in the DB, in the image option field, I have the following:
a:1:{i:20130709120201;a:8:{s:2:”id”;s:14:”20130709120201″;s:4:”file”;s:114:”***/wp-content/uploads/2013/07/1+flight+centre1.bmp”;s:8:”file_url”;s:92:”***/wp-content/uploads/2013/07/1+flight+centre1.bmp”;s:9:”thumbnail”;O:8:”WP_Error”:2:{s:6:”errors”;a:1:{s:15:”image_no_editor”;a:1:{i:0;s:28:”No editor could be selected.”;}}s:10:”error_data”;a:0:{}}s:13:”thumbnail_url”;s:72:”***/wp-content/uploads/2013/07/”;s:11:”slide_title”;s:0:””;s:10:”slide_desc”;s:0:””;s:14:”image_links_to”;s:0:””;}}
Hope this helps.