Well you should be able to vote it up. And if it's your own post you would still see grey arrows.
First try reloading the page in case the images didn't load for some reason. If it's still not working, please can you take a screenshot/photo and post it here? (You can use imgur.com for easy hosting if you don't have anywhere else to upload it.)
EDIT: OK I see the problem, in Internet Explorer. I put in a quick fix on the main site but I will sort it properly later. Thanks for letting me know about the issue :)