I kept having this problem while testing today, where my game would entirely stop picking them up when I walked by or jumped on them (but sometimes could still click other stuff like animals, and other times it would simply say "working..." when I tried. Usually that led to a server disconnect, but for the last hour of testing I only had the object problem without anything else, and it didn't go away when I reloaded.
I'm using the latest version of Google Chrome.