Modules disappear if linked directly to component

The following is happening.

Eg, when somebody fills out a wrong username/pass in erg CB login , he will be redirected to the following page www.mywebsite.nl/component/comprofiler/login.html

When this “page”, which is directed to the component, opens, several modules will disappear.

I also have a birthdaymodule, which have a direct link to a user, eg like this
www.mywebsite.nl/component/comprofiler/userprofile/username.html

In this scenario the link also directs to the component

The modules which are selected on "All pages" are still shown, but as soon as a module has the status “Only selected” those modules are not visible!

After some studies, this is the case in Joomla 1.5.6., but also in Joomla 2.5.x

Sorry for "bumping", but it's a very nasty problem.

If only somebody could point out where I can find the "error-script" which make our users re-direct the link www.mywebsite.nl/ component/comprofiler/login.html

I could create a "hidden" menu item with this link

The the redirect should be
www.mywebsite.nl/loginpag/login.html

Note : loginpag is the "alias" of the menu-item

In other words, maybe this could be the workaround, but pls help finding the php?? script (and rulenbr)