I have several sites using TimThumb script [http://www.binarymoon.co.uk/projects/timthumb/]. On some server of mine it works like a charm. On others I have randomly broken thumbnails. See e.g. http://www.batik-mirinvento.it/la-galleria.php?galle=accessori&dida=accessori… (Budget: €30-€50 EUR, Jobs: HTML, PHP, Script Install)
