Hi
after updating to D7 i get this error:

Notice: Undefined index: category in theme_simplenews_field() (línea 2482 of /srv/www/drupal7/sites/all/modules/simplenews/simplenews.module).
Notice: Trying to get property of non-object in theme_simplenews_field() (línea 2482 of /srv/www/drupal7/sites/all/modules/simplenews/simplenews.module).

for each of the visible fields of the newsletter, I had to fight against upgrading mismatching (the taxonomy vocabulary) and got that fixed, but this one is driving me crazy, the system seems to work though.

Simone