BUG: "Open Resources" not repopulating (L5.1 b4 MAC)

This post has been copied from the stable forum since I am now on beta. Currently I am using 5.1b4 (Mac)

As you can see in the screen shot below, "Surprised By Hope" isn't listed under the "Open Resources" section of a basic search. The search panel was opened BEFORE the resource. By closing the panel and opening a new one, the resource does appear (see second screen shot). In other words, the "open resource" section isn't repopulating. 

I don't know if this is a "bug" or an "unimplemented feature." Either way, it should be fixed.