For several years I have a site running at DreamHost using vBulletin software (3.8.4)).
No problems until yesterday while all of a sudden thumbnails are no longer created with GD when uploading .jpg images. Other formats, like .png, still work fine.
Rebuilding the thumbnails with vBulletin software ruined all existing .jpg thumbnails.
I haven't changed any settings that may have caused the error (site was running problemfree). Has DreamHost changed server settings? Or are there any other ideas that can bring a solution?