Open a document in the editor, change something, then save it. The following JS error appears in my console after saving:
TypeError: $editorDocument.children(".ve-ce-branchNode:last").offset() is null
[Break On This Error]
$editorDocument.children( '.ve-ce-branchNode:last' ).offset().top
ve.Surface.js (line 184)
Observed in Firefox 14.0.1.
Version: unspecified
Severity: normal