I can change styles via My Stuff > Edit Preferences. Using the Style Chooser menu at the bottom of a page, however, I encounter the same problem Artie did.
FWIW, I can confirm this behavior, including the observation that a style change works perfectly fine when using the pulldown menu in display prefs item #7 instead of the one at the bottom of the page. While bizarre, it seems to point to a specific location for the issue.
