Facebook issue, can't post to Wall

Hi all,
After the recent Facebook update, I can't seem to find the option of posting to someone's Wall anymore. I'm able to comment and Like posts already made, but not make a new post. I've checked several different Walls and it seems to be a consistent issue.
Anyone else noticed this, and is there a fix for the problem that I've just missed?

EDIT:
Should say I've been able to post on Walls using touch.facebook.com in the browser, so I think this is an application issue.

 

I tried that, but nothing showed on either their wall or mine. I then tried it again, this time tagging them in the post dialog box, and that worked. I knew it was something I hadn't figured out yet, thanks for pointing me in the right direction!