Thanks Smartys.
I guess it's possible we've done something wrong without realising as we are new to using PunBB.
Is there any chance you could you possibly post your code here if it's not too much trouble? If it's working for you perhaps we could check for any differences and fix it by matching ours to yours, if we could see what we should expect in the code to get the words 'Forum home' (not just Forum) displaying in the links.
BTW, did it take you long to do - I'm not a programmer so am not sure how complicated it is to make this change to the word in the code?