I can't see Hints

I Had a problem, While I I’m reading and listening the lesson, I 'm clicking on unknown words, or highlighting it, nothing occurred, Others talk about to see on left at the top of pages, i don’t see anything. So this time, I a m not satisfied and I can’t have new vocabulary words. so I’d like to know what to do.
It’s my second time but the first time, everything was OK and I could receive my hints by e-mail; My flashcard was OK too. I don’t know what happen this time.

Hi joliecouer,

Unfortunately, the site is behaving strangely in IE today. We are working to fix it. In the meantime, you will not have these problems using the site in Firefox. Sorry about that.