Just upgraded to 3.7.1.
Two problems:
1. my header image disappeared and was replaced by those three (ugly) green ones. This I could solve myself.
2. My logo image is not showing. Everything seems to be OK (The right URL is in the code). If I click on the image error message it appears. (?) (In IE7). In Firefox it shows the alternate.
Website: www.kraaij.nl
WP 3.2.1