On the main page of BG:
Could be server problems. It's working for me. Try refreshing the page. Try switching browsers.
Another BG member has mentioned that every time he clicks on a cemetery, it comes up blank and he has to refresh. But only once each time. I've found that happens to me occasionally, but not consistently.
If it's persistent and you can't ever get to the Search screen, and nothing you try works, and you're a BG Plus member, you can try reporting it to them via the support form, but I don't know if it will do any good.