https/SSL issues

First of all I really like free Virtue theme. I already built the whole web site as an ecommerce. There is, however, one thing I would like to point out here- I am having some issues when activating ssl. For some reason, instead of padlock being displayed right before my website’s url I see warning triangle.

If I remove all the images from my website (that includes the logo too) the warning triangle disappears and padlock is shown again. That was also the solution our hosting provider came up with but that is just not an option for us because that way we are loosing logo and all the product images from our shop.

Btw, i am using latest version of WP (4.0) and latest version of woocommerce (2.2.4)

Is there a solution?

Any help would be very much appreciated.

Thank you