This is an intermittent bug, but I encounter it very often. If I have two Document Panes open, A and B, and switch focus from A to B, navigation keys (up/down arrows, page up/down) have no effect in B, but continue to effect A. In other words, focus has changed and document B is now highlighted, but the cursor keys are still operating as if focus was on document A. Generally it will start off working as it should, but at some point the problem will occur.

The filtering capability of the omnibox is great, but I don't get highlighting as I type (as shown in the first screenshot) , and I can't use the keyboard to get to the results, andrequire the house to select (see second screenshot)