Web page issue and yeah i am sure this is the wrong place to say this.

I was on the web page

https://id.arduino.cc/Main/LedControlDemos#CascadedDemo

when I click log in i logged in,

now I want that web page to ask for help and I can not get to it for nothing

I end up on the LOGIN profile page WHY

How do I get help on the ledcontroldemo page?

https://playground.arduino.cc/Main/LedControlDemos

That takes me to the led demo page

And

https://playground.arduino.cc/Main/LedControlDemos#CascadedDemo

Drops me into the cascaded.

Notice the proper URL's without the ID bit you seem to have.
Maybe you CP'd something wrong or manually typed in a URL ?

I see from your tag line you are security conscious.
Maybe you have something blocking certain aspects of web pages ?
How often do you clear your cache etc ?