Ah, thanks guys - serengeor is right; it's the video drivers. I didn't read far enough up, my apologies. ==14969== HEAP SUMMARY: ==14969== in use at exit: 27,758 bytes in 318 blocks ==14969== total heap usage: 3,119 allocs, 2,801 frees, 667,560 bytes allocated ==14969== ==14969== 112 (8 direct, 104 ...