Another redirect on login question

I read the thread in " back to the article after login " and I have a similar problem.  I want an Event Invitation email link to send them to the Event after login.

Every link that requires the user be logged in I redirect to our frontpage.  Their only option at that point is to log in with our Mobile Bar extension.  The CB Login extension runs on every page once logged in.

Mobile Bar claims CB Integration but I don't know exactly how it logs in. It has a redirect on logn option which I turned off.  I have tried appending a "return=[encoded url]" argument to the frontpage URL and it ignores that.

Any ideas?

Ensure your CB Login Module has its login redirect parameter empty. If you're using a 3rd party login module then there's nothing I can suggest. CBs login process is exclusively looking for &return=BASE64ENCODED_URL_HERE as is standard Joomla implementation. It will also fallback to checking the POST data for the return URL.

OK, Mobile Bar appears to be doing 'index.php?option=com_users&task=user.login' which is just the Joomla login, right?

It's also doing this (POST on Submit): , but $return is simply the page I logged in with, which includes my own base64 encoded return argument... 
If I force $return there to my own return Arg, it just ignores it. So I see /components/com_users/models/login.php handling $return and can't tell why it's ignored.

Yes, that's Joomla's login page. Then it's likely CBs system plugin is taking over and redirecting to CBs login page causing the return URL to be lost. You need to use CBs login module. I cannot guarantee return redirects will work correctly with other modules.

I have finally fixed this, after many hours of debugging.  I will post just a few details how, in case anyone else is interested.

On our site, (modified) SiteApplication.php redirects whoever is not logged in to:
\JRoute::_('index.php?option=com_users&view=login', false);
( the url returned is "/cb-login ), and that page is our Frontgate ( "/" )

I modified that to include a return value with the url of the page it was redirecting from.

Then I noticed JF Mobile Bar's idea of "$return" was whatever page you were on when you logged in ( always "/" for me). So I modified "/modules/mod_jf_mobilebar/mod_jf_mobilebar.php" to test for a return value in the current url. If so, sets $return to that, and if none go to our homepage (the default "redirect on login"). 

Basically, a penultimate return.