I get this "recoverable fatal error" when clicked on "Save configuration" in theme settings of the subtheme of AT 7.x-3.0-alpha5 (see the attached graphic):
Recoverable fatal error: Object of class stdClass could not be converted to string in include_once() (line 85 of C:\Program Files\Apache2.2\htdocs\drupal7\sites\all\themes\adaptivetheme\at_core\inc\forms\at_core.submit.info.inc).
The error only appears on EXISTING Drupal installations (v. 7.12).
The older version of AT was properly uninstalled in admin (all the old files were even deleted), the cache was cleared, and the new AT reinstalled from scratch.
The error did NOT appear in NEW Drupal installations. Everything is ok in a new Drupal instance.
But, I would like to be able to upgrade and work on an existing install, so is there a manual workaround? (I don't mind going into the database to fix it if it is possible, if somebody tells me what to look for.) Thanks for a great theme.