CSS and Images not working after migration

Hello everyone,

I have seen plenty of posts similar to mine but none of them helped me. I recently migrated a site from one server to another. The domain name changed as well. To start with basics I searched and replaced all URLs on database. And here is what is going on:

What works:
Links are fine and context (text only) is visible.
I have a gallery installed (Nextgen-gallery) and the gallery itself is working. What I mean: Lightbox is working but all pictures are gone.

What is not working:
1. As I said pictures are gone. In gallery I get a “The requested content cannot be loaded.Please try again later.” message. Also non-gallery pictures are not showing up, EXCEPT from one that is embedded in a post.

2. CSS seems as if it’s not loaded/recognized. I checked the path with inspect element and it seems ok. I am also having a feeling that , for the front page at least (no gallery used there), it’s the missing/broken css causing the pictures not to load.

I did the migration taking this http://codex.wordpress.org/Moving_WordPress and plenty of other tips/guides into consideration.

I appreciate your time reading this. Any ideas? It’s the css mosty I’m worrying about.