I asked here, but haven't seen any replies.
If I make a child theme of twenty ten everything works great with plugins, css, replacement templates etc. However, as soon as I add any kind of functions.php to the child theme folder, I get all kind of white screen problems that vary depending on the functions.php.
1) Copy the twenty ten functions.php exactly as it is into the child theme folder: everything goes white. Can't load any wp-admin pages. Site itself is a white page.
2) Use a very simple functions.php as follows:
<?php if (!is_admin()) add_filter('widget_title', 'do_shortcode', 11); ?>
Things seem to work, but actually any page/post updates and other types of events will result in a white screen. Using the back button shows that updates were made, but getting a whitescreen all the time is annoying and worrisome. Worse is that the login screen does not work any more. As long as I stay logged in, I can work. But the log in page changes to a white screen with this little piece of garbage characters: "ï»¿" (not sure if that will be reproduced accurately).
Any helpful advice?