To begin with, could you let me know the version of Whoops you are using?

I don't know how to check the version. I just installed Laravel 4.1 a week back.

That's okay. It means you are using Whoops 1.0.10.
There are no known issues that resemble anything like you tell.

If you would be willing to debug this, I could guide you on what to do.
To begin with, it seems that the Whoops is not being registered as a handler at some point in the runtime of your application. Could you play search around, see if anything in your application does anything with set_error_handler or restore_error_handler?

your help is much appreciated. I'll look around. In the meanwhile, I've pasted the stack trace of last error, not displayed by whoops. http://laravel.io/bin/Y2V6

where can I find set_error_handler? I'm just a couple of months into frameworks as such.

ok, found quite a few instances of set_error_handler

E:\My Data\htdocs\laravel4\compliance\vendor\filp\whoops\src\Whoops\Run.php:
110 class_exists("\Whoops\Exception\Inspector");
111
112: set_error_handler(array($this, self::ERROR_HANDLER));

To give you further insight, this is precisely what I was coding when the whoops pages first disappeared.

http://laravel.io/bin/mWxq

Wonder anything wrong I did here thats a no no in laravel 4.

I'm sorry, after reviewing everything, I'm no closer to the solution.
I am afraid this is something misconfigured in your project and you'll have to solve it on your own, unless you manage to provide exact steps to reproduce the problem on a fresh installation of Laravel. :(

Ok, I'll try to do that and get back to you. Thanks for your time and help.

i've finally traced the issue. I had following code in my routes.php.

App::error(function(NotFoundHttpException $e)
{
    return View::make('Not Found', 404);
});

Ah, so you have installed your own error handler, I see.
I am glad that you have found the issue!

Well that makes sense no, if you catch the Exception, then there's no reason for Whoops to trigger is there ?

Actually, like I mentioned, I'm still new to Laravel. And I didn't know how whoops operates. Thats one step up the learning curve though.

Another thing I found though. I've got this code in app/start/global.php

App::error(function(Exception $exception, $code)
{
    Log::error($exception);
});

And then I have this another piece in my routes.php

App::error(function(Exception $e)
{
    Log::error($e);
});

Isn't this redundancy?

I think you should really seek some help on Laravel about this.

ok, thanks alot for your help and time. .