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I was unable to log on to my PayPal developer account until I deleted the PayPal cookies from Chrome. This allowed me to log on but clicking on Profile or Settings within the Profile drop-down results in an error page saying "Please login to use the PayPal Sandbox features".
Logging in again did not help. Creating a new account (buyer or seller) did not help either.
This is in the new Sandbox environment.
Strange as it may seem, deleting your developer.paypal.com should resolve this.
The reason for this is that you've got cookies from the old developer portal in place which interferes with the new portal / sandbox environment.
After you've deleted all your cookies / all your paypal.com cookies, you should be able to login to the new developer portal and access any sandbox accounts without any issue.
A fix for this is going out shortly.
If anyone is still having problems accessing their My Profile (other than My business info) in the sandbox (i only get the perpetual loading animation) - then just use this link:
https://www.sandbox.paypal.com/us/cgi-bin/webscr?cmd=_classic-profile-summary
Paypal sandbox is generally broken for everyone, seeing a lot of people complaining about it. It was ropey at best before, seems to have truly died now.