I'm running russian language web-site (drupal 6, last version) and I'm using AF quite a long time.
Althought, I'm not sure it's AF issue, I think I need to report it.
I have errors on all views created by AF:
htmlspecialchars() [<a href='function.htmlspecialchars'>function.htmlspecialchars</a>]: Invalid multibyte sequence in argument в файле /home/bval/domains/uchi.kz/includes/bootstrap.inc в строке 856.
When I switched off AF, the error dissapeared.
I have no such errors on another views.
This problem might be related to core issues http://drupal.org/node/523058#comment-3739942 and http://drupal.org/node/755758. Apparently, something was changed from 6.17, so the error became more visible. Still, it might be related to many views template files, used by AF. If you have a small error like ANSI coding instead of UTF-8 or some symbols or something small like that, it may cause error on non-english sites.
Please, verify :)