I have created products with variables that have images tied to them. When you first go to the product page, the image is sized correctly. No distortion. Once you select the color and the size variables, it displays another the variable version of the image (which is the exact same size), but it distorts the image size. It looks to shrink the width. (the hover feature still shows the image in the correct dimensions it seems)
See the screenshots below:
https://www.dropbox.com/s/v2vm35shbg3s0gy/product-size-after-options.png
https://www.dropbox.com/s/6rxodqqigyilica/product-size-before-options.png
