ahHA ! so diagnostic is find problem.
Cannot find cat ID value: 2 under FTP folder: data/thumbnails/2 and / or in table. image.jpg file has been found in 4images_images table Matched cat ID value: 2 for: image.jpg file..
Ok so is mean CATEGORIES_TABLE is find cat_id
no 2 but folder
no 2 is no exist in FTP (or change in FTP and no change in CATEGORIES_TABLE and IMAGES_TABLE for cat_id field from ACP). This is bad but now you see what is source. Solution: Recheck cat
no 2 in CATEGORIES_TABLE, IMAGES_TABLE and FTP folder for all match.
Error(s) found: 536
536 ???
Wow ... now check your data/media and data/thumbnails folder + CATEGORIES_TABLE and IMAGES_TABLE for all match.
Note: This problem is nothing do with
safe_mode . This is upload / backup-restore problem.