Is this a bug or glitch on my computer

[firefox]

on the Dashboard
I click the plus button and add the panel
"thermal sensors"

I click the edit button of the panel

Marks the two empty boxes
When I click the Save on the panel itself
I get an error

Is this a bug or glitch on my computer ?

[kejianshi]

Is this IE?

[firefox]

no
it is firefox
last ver on ubuntu

[kejianshi]

Weird - Clear your browser cache and history and try again.

[firefox]

It worked
Thanks

[kejianshi]

No problem - Just a lucky guess.