I have this same problem however I have noticed that it only happens when I change the filtering options for the amount of colours. Searching for a tag works fine but moving the number slider or selecting any of the filtering buttons creates this problem.

I'm also seeing this error. There's an error in the browser console:

"Uncaught TypeError: n.user is undefined". That may or may not be related.

I've tested on Chrome & Firefox, get the same problem on both, but the error message is different.