Safari won't open a new tab
I'm using Safari 5.0.5 and when I hit command+T or when I right click on a link to open in a new tab, it doesn't open a new tab, it gives me a white page and the URL reads the same page I was previously on. I can't find anything that explains why it might be doing this or how to fix it. I haven't changed any settings recently, nor have have my browsing habits changed. Help?
MacBook, Mac OS X (10.6.7)