As per http://www.w3.org/TR/CSS2/visudet.html#propdef-vertical-align the vertical-align property is not inheritable. <td> elements will not inherit vertical-align from a parent <tr> element.
The most noticeable place this error is seen is with the metadata column for bugnotes in view.php/etc. In opera, the metadata will be vertically aligned to the center which is ugly/hard to use for large bugnotes.
Firefox does seem to inherit vertical-align whereas Opera doesn't. The solution is to apply vertical-align to <td>'s and not <tr>'s. | 
