I don't know if i'm alone but i've had problem connecting/posting content on Steemit since this morning and I just found a solution.
I don't know if it's common knowledge but i figured out that I should share it, you just have to hit the link below and...Tadaaaa, you can post everything you want again!
https://steemit.com/submit.html
Also if you're having troubles connecting, just hit the upvote button and you'll be redirected to your account connection window.
Enjoy! And be creative!