Frustration!

very frustrated and irritated right now with blogger! for some reason, for a while now, i am not able to comment on other blogs!! is says i have to sign into an account. I'M ALREADY SIGNED INTO MY GOOGLE ACCOUNT PEOPLE! and even after i sign into my account AGAIN, it will prompt me to sign in AGAIN AND AGAIN... frustration. the other day i was able to comment one ONE blog... frustration. whats wrong!!