Help, Please: Box of String - Can't Take Any.

[ChuisCeQueJeCroi]

When I saw the box of string (before the electric fence), I knew I'd need to take some... but I'm not able to manipulate it or take any. I read a walkthrough, and it said to take the string.

I cannot move the lid of the box, nor can I select the string, much less take any. All I can do is right click it and it tells me that it's a box full of string.

Please tell me how I can go ANY further without this - it's infuriating.