Sorry to hear of the problem you are having.
I could confirm the issue on my test site therefore notified the theme developer about this so that it will be fixed.
The issue will be fixed ASAP.
In the meanwhile you can use image in the widget as described in the following page.
The issue is fixed in the following latest version of theme so please update your theme to the latest version.
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You can update it by either deleting existing theme and then install latest theme version of it or use the following plugin to update the theme.
After activating the above plugin just install the downloaded theme on your site.
You won’t lose your site content after updating the theme but for safer side you can take backup of your site before updating the theme.