I find accented A characters (like this--> Â ) scattered in my WP posts after upgrade from 2.1.2 to 2.5. They seem to be at end of words as if extra space characters. When I fall back to 2.1.2 and re-import my backup 2.1.2 database file they are not visible in my posts. but when I re-converting the database with /wp-admin/upgrade.php I see them again in the posts. However using phpMyAdmin to read the raw file I see the bad characters in both the the converted and unconverted files. I'v moved thing back and forth so many times that I'm not sure that I didn't corrupt the backup by an impropper setting in the phpMyAdmin export window. I'm using phpMyAdmin version 188.8.131.52 which newer and has a few more tick boxes and entry/selection fields than in the WP backup instructions, but I did tick the boxes recommended, but didn't mess with the other defaults that I did not understand.