Have you looked at the HTML source of the page? There are three possibilities:

1. The text is there. In that case, it's a browser problem. The next thing I'd check is type style preferences for links. Maybe it's displaying it as white text. (You can also check that by dragging your mouse over where it should be.)

2. The text isn't there, but you can find where it should be in the page source. If it's a regular link, it should be between something that looks like <a href=Web URL>, where the URL is wherever the link goes to, and </a>. In that case, it's something like a firewall keeping links away from your computer.

3. You can't find where it should be. In that case, this suggestion didn't help.