I am running Joomla 1.5.8 and CB 1.2 RC4. Using CB Login module, joomla login module is not setup.
If a user's session times out (they have been inactive for too long), when they try to go to a page that they need to be logged in for, they are taken to the com_user login page instead of the CB login page.
What needs to be set/done, so users are taken to a CB login page instead of a Joomla login page on timeout?
Have you disabled registration in the Joomla global configuration and disabled the Joomla login module? If so, there's an extension in the Joomla Extensions directory that will stop the Joomla login form from activating so that only the CB login is used.
The worst that happens is that it doesn't work or you have to enable legacy in Joomla Plugin Manager. Might be worth a try at least until we can narrow down the problem.
First, I'd upgrade to stable version, since there was a Joomla problem that might be related to yours that's been worked around in the stable release.