First time i have that problem. I have use the xcgal before and everything was ok.
I have also problem and in the english version of the webpage
http://www.technoxyl.com/english/modules/xcgal/thumbnails.php?album=1
You thing that is better to upload all pictures again? To delete everything and to upload again?
The thing i dont understand is: why the normal_image is ok and the original image have problem. When the image corrupted...?