Tomatocart question

hey everyone, I have a site im testing with tomatocart

if anyone is familiar with it here is my issue

i use the admin panel to upload an image
i can see the image when i click the name of the product, it pops up in a window, so the original is there, i checked the file manager for it
the folders show as writable
there are no thumbnails, mini images or any others
do i need a plugin to create the other images? or is this a bug with tomatocart and if it is a bug how do i fix it?

thanks for any help in advance