When the plugin is enabled on a product, the product image is overridden with a blank layer like this. How can I fix it? Please advise!

Also, is there any way to make the alignment on the lightbox to center instead of left, if so, please let me know.

Thank you.

1) Try the option to update the product image from the lightbox, WooCommerce tab in the settings.

2) Yes, with custom CSS, something like this for example:

.fpd-container{

    margin:0 auto;

}

.fpd-modal-product-designer{

    width: 800px !important;

    margin: 0 auto !important;

}