Tracking down WSOD: Some problems with users controller and acl component

Hi everybody

I'm having another nasty white screen of death and I'm tracking it
down right now. I came down to the following...

I'm having a UsersController that uses the Acl component. When trying
to create/update a user (after submitting the form) i get the feared
WSOD.

The execution of my code seems to break in cake/libs/controller/
component.php in the method triggerCallback(...)

The original method looks like this:

function triggerCallback($callback, &$controller) {
foreach ($this->_primary as $name) {
$component =& $this->_loaded[$name];
if (method_exists($component, $callback) && $component->enabled ===
true) {
$component->{$callback}($controller);
}
}
}

For debugging purposes I added a die(...) statement:

function triggerCallback($callback, &$controller) {
foreach ($this->_primary as $name) {
$component =& $this->_loaded[$name];
if (method_exists($component, $callback) && $component->enabled ===
true) {
die("component: {$component}<br/
>callback: {$callback}<br/>controller: {$controller}");
$component->{$callback}($controller);
}
}
}

And the output is:

Warning (4096): Object of class AclComponent could not be converted to
string [CORE/cake/libs/controller/component.php, line 185]

Component::triggerCallback() - CORE/cake/libs/controller/
component.php, line 185
Controller::startupProcess() - CORE/cake/libs/controller/
controller.php, line 527
Dispatcher::_invoke() - CORE/cake/dispatcher.php, line 187
Dispatcher::dispatch() - CORE/cake/dispatcher.php, line 171
[main] - APP/webroot/index.php, line 83

Warning (4096): Object of class UsersController could not be converted
to string [CORE/cake/libs/controller/component.php, line 185]

Component::triggerCallback() - CORE/cake/libs/controller/
component.php, line 185
Controller::startupProcess() - CORE/cake/libs/controller/
controller.php, line 527
Dispatcher::_invoke() - CORE/cake/dispatcher.php, line 187
Dispatcher::dispatch() - CORE/cake/dispatcher.php, line 171
[main] - APP/webroot/index.php, line 83

component:
callback: startup
controller:

It looks very strange to me that $component is empty and $controller
is empty too, but I'm also quite surprised that actually there is even
more output now (the two warnings) where there haven't been warnings
before but only a WSOD! AND I'm very surprised that these warnings
haven't been written to the error.log before (when WSOD appeared) but
are written now (when using die(...)). This isn't a feature, is it?

Well, despite knowing a bit more now, I don't really know how to fix
this. Maybe the UsersController code would help? It's quite long and
*very* dirty (it's not mine, I've taken it over from my preceeder, and
I'm working on cleaning it right now), so I uploaded it rather than
putting it here into the text:

(argh, my webserver's got problems right now, I will try and upload it
a bit later...)

Well, any help would be highly appreciated. I tried tracking stuff
down, but I'm not that versatile with CakePHP yet, so I'm stuck.

Thanks and have a nice weekend, guys :-)
Josh

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