New posts not being saved

Hello,
I tried several times to publish a new post from frontend,
the composer says that the post is being saved, but when I close the composer the
post is not being created at all.

Here are the steps I followed:
- opened the composer to create a new post with the normal mode (not the quick mode)
- added a youtube embed block on top of the text block
- embedded a youtube video
- pasted some text in the text block
- selected both my categories
- clicked "publish post"

I see the "saving" popup window, after that I still see
the composer window, I click teh "X" in the top right side
and close the composer window

the post is not being created
I tried several times just to be sure

here is a video of me trying to save this post
http://screencast.com/t/f5HEH7R4EK

I did not test posting from backend but I posted and article successfully from backend
some weeks ago right after installing easyblog

Thank you