SMFHacks.com

I've got gallery running on my SMF forum (1.1.3) and it works perfectly until i try to upload a file over a certain size, i've set the max upload to 10meg and the dimensions to 3000x3000 pixels but when i try to upload a file http://www.rystein.co.uk/Dump/new2.jpg (that is a picture of me btw) which is 568k 2272x1704 (well within the stated caps)  i get Error 500 - Internal server error, but when i connect to my server by FTP and look in the gallery directory, my file has been uploaded (repeatedly), so i'm guessing it's not a database error or something silly, i've tried renaming the file, but i'm using a hosted package and can't see the error logs..... anyone shed any light on this please ?

i know i could resize the file but that's not the point