I don't know if this is the right place or not. Has it says Support and suggestions.
Whenever i go to look for a game via the tabs up top like say Action games it comes up and says "No games were found!" it is the same for all the tabs. It first happanned to me about 5:00 p.m. cst. So i logged out and come back about 2 hours later.
No games were found! Being a direct quote from the page.
It could be a cache issue. I remember the Forums not working a few days ago; I left the problem on Get Satisfaction then cormyn told me it was just a cache issue. So the same thing could be happening with the categories, for you.
The categories on the green bar are working fine for me.