Hello Bert,
We don't have any general issue, so this seems to be related most likely to your browser.
Are you using a bookmark to get to these pages? In that case I would suggest to try and just go to https://rally1.rallydev.com and "manually" navigate to that page. Does it work then?
You can also try an incognito window or different browser to check whether your browser cache is causing this issue.
Can other users from your subscription open the pages without trouble?