I'm not quite sure whether this is a bug or not.
In the Beta..the ESV now keeps it's interlinear pane "centered" on the active passage when you scroll...
the only problem now is....that makes it very draggy as opposed to the other way; when it didn't recenter unless you clicked in a verse...
I realize that this is an attempt to fix an issue that we complained about, but now I'm also complaining that it's not working out for me....sorry... [:O]