The cookies problem

I to experienced the your browser does not support cookies error when logging in on my website. I haven’t changed anything big before I got the error. Just restarted my computer and I couldn’t login anymore.

So I followed these steps: http://codex.ww.wp.xz.cn/Login_Trouble

And after changing te name of my theme (fp_discover) folder, I could login. The website was blank though.

Does anyone know what the problem could be?

http://www.amsterdamsehonden.nl (still in coming soon mode unfortunately)