XnView Software

It's easier to see if you have the preview set to the lower left pane. When both preview image and info show on screen, make the left pane larger, and drag the preview/info separator left to enlarge info, then click off preview. Now resize back down the left pane, and it'll go way over to the left. Info will always resize to as large it was before, regardless of the current window size, so it can be impossible to reach without pulling the pane out. It should take the current window size into account.

A pic to show the effect:

Confirmed.
The separators (all states) should always stay within preview window limits. Or better: use % relative to the window size.

All fixed in beta2. It's kind of funny to watch it go. =p