If the problem is that it stalls and your browser says something like "conecting to cache.betfair.com" for quite a few seconds, then the problem is they removed/broke that and it doesn't work. The solution is to get your hosts file (assuming windows) and insert an entry for that link, cache.betfair.com I think it is, and make it to be 127.0.0.1 which is your own computer. Your browser will then immediately see it can't find a server there and immediately fail. Since I did this I've not had an issue.
If the problem is that it stalls and your browser says something like "conecting to cache.betfair.com" for quite a few seconds, then the problem is they removed/broke that and it doesn't work. The solution is to get your hosts file (assuming windows)