Hi I am running into a similar problem, I am uploading large image files using filezilla. I have only one gallery up at the moment and have resized the images in nextgen and all but one thumbnail worked.
With the next gallery which I tried to upload none of the thumbnails worked and i got the following error message when i tried to regenerate the thumbs:
Warning: imagecreatefromjpeg() [function.imagecreatefromjpeg]: gd-jpeg, libjpeg: recoverable error: Premature end of JPEG file in /home/gaptron1/public_html/xtrospective.com/wp-content/plugins/nextgen-gallery/lib/gd.thumbnail.inc.php on line 179
Warning: imagecreatefromjpeg() [function.imagecreatefromjpeg]: ‘/home/gaptron1/public_html/xtrospective.com/wp-content/gallery/the-slab/20111008-The Slab 317.jpg’ is not a valid JPEG file in /home/gaptron1/public_html/xtrospective.com/wp-content/plugins/nextgen-gallery/lib/gd.thumbnail.inc.php on line 179
Warning: Division by zero in /home/gaptron1/public_html/xtrospective.com/wp-content/plugins/nextgen-gallery/lib/gd.thumbnail.inc.php on line 288
Warning: Division by zero in /home/gaptron1/public_html/xtrospective.com/wp-content/plugins/nextgen-gallery/lib/gd.thumbnail.inc.php on line 301
Warning: imagecreatetruecolor() [function.imagecreatetruecolor]: Invalid image dimensions in /home/gaptron1/public_html/xtrospective.com/wp-content/plugins/nextgen-gallery/lib/gd.thumbnail.inc.php on line 434
Warning: Division by zero in /home/gaptron1/public_html/xtrospective.com/wp-content/plugins/nextgen-gallery/admin/edit-thumbnail.php on line 42
Select the area for the thumbnail from the picture on the left.
Any idea on what is going on there??
Any help would be greatly appreciated!