When you have a problem with one particular site, a good "first thing to try" is clearing your Firefox cache and deleting your saved cookies for the site.

1. Bypass Firefox's Cache

Use Ctrl+Shift+r to reload the page fresh from the server. Any difference? If not...

2. Clear Firefox's Cache Completely

orange Firefox button or Tools menu > Options > Advanced

On the Network mini-tab > Cached Web Content : "Clear Now"

3. If needed, remove the site's cookies in this dialog

While viewing a page on the site, right-click and choose View Page Info > Security > "View Cookies"

Then try reloading the page. Does that help?

Does this also happen with the current Firefox 15 release?

• Firefox 15.0.x: http://www.mozilla.org/en-US/firefox/all.html
• Firefox 10.0.x ESR: http://www.mozilla.org/en-US/firefox/organizations/all.html
• Firefox 3.6.28: http://www.mozilla.org/en-US/firefox/all-older.html
• ftp://ftp.mozilla.org/pub/firefox/releases/latest-3.6/

its working :O thx ^^