There is a name space conflict between the sidebar plugin and the inove theme as they both use the id "subscribe" for the ul tag.
This can be fixed in inove with simple changes to:
rtl.css
sidebar.php
style.css
and also three places in the menu function in
js/menu.js jsrtl/menu.js
The better solution is for both blubrry and inove not to use as common a tag name as "subscribe" within what is, unfortunately, a shared name space.
The symptom is that the h3 heading, "Subscribe", appears but the entire contents of the <ul> tag not not display leaving an unexpectedly short widget in the sidebar.