This issue was known to us and we have been providing info on the forums as you can similar threads around. (That's why player should visit forums as well)

Solution:

Clear your cache, cookies & history (All of it)

Login Again & it will work.

Update to latest version.

I will prefer Chrome, if it is not working try firefox.

I know you said you tried both but follow the steps earlier & than try again.

IE 7  Is getting zero load right now. I was playing and the game kicked me out.
I switched over to Opera and signed back on with no problems.
I went and cleared all cookies, cache and History and still get zero load on IE 7.

Still logging in fine on Opera.
I have logged in the last 260 days in a row.

When ever you need to preserve your log on prestige 
Use a different browser.. I also can resort to fire-fox - but i have never had lack of log on with Opera.

I will safe guard haven and do basics on opera and keep checking on IE 7 until it works again.
IE 7 can get a lot more done fast and I am used to refreshing often before game freezes as it does.
This method has served me well when doing time sensitive operations.

Best Regards to all

So, I've been trying to make sure cache is clear each time this occurs, but I did have an incident yesterday where I was not able to login at all and clearing cache would not help the issue. I didn't expect to actually be able to login today, but just tried and things worked perfectly.

Good to know this issue is being looked into, it's quite frustrating when I lose dailies and time. If it happens again where clearing cache doesn't work I'll try to get additional information and maybe a screenshot if it helps. When it happened yesterday it did not appear the same way as the 0% loading thing. I think the screen was just blank.

Yesterday our servers for down. It did effect people couple of time and lately been taken care by our developers.