I just started exploring courselab,
and I'm having problems because sometimes, I can't use some of the menu because it won't appear.

For instance, I go to "File-new" and my mouse is right over 'new', but the submenu for 'new' doesn't appear.
Right now, I am unable to insert a picture. I click on "insert", and I have my mouse over "picture", and nothing appears. (I didn't click on "picture" though. I tried it once, and the whole thing disappeared, so..Im just placing the mouse over the menu, without clicking on it)

A minute ago, it worked fine, and a minute ago, it didn't just like now. Sometimes the menu appears fine, sometimes it doesn't. Right now, it doesn't and I can't get it to work.(I'm stuck for about 20 minutes now because of this)

Is it just me, or does anyone else have this problem?
What should I do?