Scrivener 2.7.1 (26120) on Max OSX 10.9.5
When exporting to .doc (97-2004), if the associated content has a comment that includes the first character at the top of a scene, the scene in the exported file will be centered or right justified instead of left justified.
As a workaround, simply don’t include the first character in the scene as part of a comment.
Suppressing comments in the exported .doc has no impact on this bug.