Index: list-tables.css
===================================================================
--- list-tables.css	(revision 46807)
+++ list-tables.css	(working copy)
@@ -1773,7 +1773,7 @@
 	.wp-list-table tr:not(.inline-edit-row):not(.no-items) td:not(.check-column) {
 		position: relative;
 		clear: both;
-		display: block;
+		display: table-cell;
 		width: auto !important; /* needs to override some columns that are more specifically targeted */
 	}