Function modules/core/Action.php@60::__construct is deprecated, please move all to core\Request, just like PageBuilder is in fact Response
Called at "@-9 ();

Remove subpage from Action, use subdirectories ...
Called at "@-9 ();

set language from actual UI setting
Called at "initialize.php@23 core\Response::setUp();

actually set some requested language - can get it from header once, otherwise get it from UI
Called at "initialize.php@24 core\Request::load();

replace page in index.php and DEFAULT_PAGE with DEFAULT_RESOURCE
Called at "initialize.php@24 core\Request::load();

It would be safer and more efficient to roll up the css and js into the single record - not use the recursion call!
Called at "index.php@20 core\factory\ThemeFamilyFactory::setThemeFamily('base');

replace "noGuids" definition with table data type
Called at "modules/core/GlobalContainer.php@390 MySQL::insert();

It would be safer and more efficient to roll up the css and js into the single record - not use the recursion call!
Called at "publicCache.php@9 core\factory\ThemeFamilyFactory::setThemeFamily('SystemWide');

It would be safer and more efficient to roll up the css and js into the single record - not use the recursion call!
Called at "folder/core/factory/ThemeFamilyFactory.php@103 core\factory\ThemeFamilyFactory::setThemeFamily('base');

loading user from session
Called at "modules/core/User.php@32 core\User::loadUser();

Added echo
Called at "publicCache.php@27 _echoBacktrace();