i have searched all over, google and drupal.org, and i cannot seem to find reference to this specific issue.
i am trying to update to 6.27 for the security fixes. i am following the standard update procedure, and my installation has no custom code (other than theme files). although it appears to go fine, one i have completed running update.php, i get the wsod. forcing on error reporting, i see that the error is:
Fatal error: Call to undefined function _system_theme_data() ... /includes/theme.inc on line 493
the undefined function is in /modules/system/system.module. by adding debug code, i see that the module is being loaded. but that function is unavailable when theme.inc tries to call it.
i see tons of other errors and discussion around this error (undefined function _system_theme_data() ), but none seem to apply to this particular update.
has noone else seen this issue when updating to 6.27? am i missing something obvious?
any help much appreciated.