Ok, thanks, but I'll explain a little bit more.

I installed Zen Cart and then purchased a templatemonster template, which came with some pre-installed products. These are products like the picture of the basket which I replaced with the larger "N/A" image. The tree product was one I added through the products section in admin. Is this saving my larger image? Would you still recommend reinstalling image handler?

(Incidentally, I didn't install it once. I just uploaded whatever was in the template.)

Thanks,
Brendan