I'm using Horizon View 7.12.
All functions work normally, but 'Navigate_next' appears as an attached screen shot on the management page.
The "refresh" button is also a phrase, not an icon.
I recently installed a total of four Horizon views on another site, two of which are OK, and two of them look like screenshots.
I don't think reinstallation is the answer.
Help me please ; (
I have seen this with older browsers like IE, clear the cache try Chrome/Firefox.
You have licensed Horizon?