If an answer is say -5, and I up-vote it, will they still get the plus 10?
From the help centre:
You gain reputation when: [...] answer is voted up: +10
This applies regardless of the current score of the answer.
As for the help links not working, you might want to post that as a separate question and tag it bug, so that the people who handle bug reports are more likely to see it and deal with it. If it's an SE-wide problem for you and not just SFF, you could report it on main meta instead; this will increase the chances of those people seeing it.