intermittent Error: CB Login module not created (required)

I've got a stubborn but intermittent problem that I've been troubleshooting since my last updates of SCLogin and Community Builder.

Most of the time (I'd say roughly 90% based on anecdotal user information and my own experience), SCLogin works fine, and exactly the way it's supposed to. No problems.

But the other 10% of the time, when a user logs in (or logs in then clicks to view protected content), the page loads with this Community Builder error in the content pane:

No errors appear in the web server log or the Joomla error log.

It appears to be somehow redirecting to the CB Login page (shown by the breadcrumb at "You are here"), though the URL bar shows the home page www.fawco.org/ ). which is throwing an error. But the SCLogin module shows the "logged in" message (screenshot attached).

I've combed through both Community Builder and SCLogin forums and checked various things:
1. the SCLogin module "Registration Component" is set to "Community Builder"
2. There is a Community Builder login module published in the system, and it is configured to appear on all CB pages and at the bottom of every site page.
3. The site has no caching enabled anywhere.
4. The site uses only Joomla SEF.
5. Not browser-specific.

The last thing I saw that might be relevant was this post:
www.sourcecoast.com/forums/non-commercial-extensions/sclogin-enhanced-login/9850-login-does-not-work#p49250

but I'm not sure if making those changes in the CB System plugin are applicable to my situation, since the login works the majority of the time.

Any suggestions as to what else I can look at, log, etc. to try to figure this out would be greatly appreciated. For example, under what conditions does CB throw this particular error?

Site details:
www.fawco.org
PHP Version: 5.4
SCLogin version: 4.4.2
Joomla version: 2.5.28 (yes I know, the project to migrate to 3.4 is underway now :whistle:)
Community Builder version: 2.0.12

Update: There seem to be two problems, one of which I've solved, the other not.

First of all, the "Error creating CB Login module" was a problem with the ACL settings on the CB Login module. That's been solved.

But there is still the problem of the SC Login and CB Login modules displaying the "logged in" menu when the Joomla session has already apparently expired.

So after fixing the CB Login module error, now the behavior to reproduce this problem is this:

1. User goes to site, and uses SC Login to log in successfully.
2. User doesn't use site for a while, and the Joomla session (set at 90 minutes) expires.
3. User returns to browser and clicks a link to "restricted" content.
4. CB Login module/form appears in the main content area, but SC Login and CB Login modules still display "Hi username" and user menu, not the "Login/Register" dialogue.

I get the same behavior whether login is done on a page accessed over http or https (SCLogin module is set to always send encrypted login info), and another extension redirects all pages to https after a successful login. That's all working fine.

But there is still the problem of the SC Login and CB Login modules displaying the "logged in" menu when the Joomla session has already apparently expired.

Is that after a page reload? Did you close the browser and restore the previous tabs? Sounds like you're just experiencing normal browser page caching and nothing specific to CB or even Joomla.

Yes, it is after a page reload. That's why I'm so baffled. But you're right, it could be some sort of browser caching -- I just can't reproduce it reliably, which is why I'm troubled by it. And I've not seen this same type of strange module "caching" on any other site I've managed where there is no caching enabled.

Check within System > Clear Cache to ensure there is absolutely nothing cache. If there is clear it all and see if issue comes up again. I know there are some Joomla templates with their own frameworks that have their entirely on caching functionality. Aside from that I'm unsure what to advise as session tracking is entirely handled by Joomla and only thing I can think of that'd cause an issue like this is caching.

I did check and System Cache Plugin and Global Configuration cache settings have all been turned off all this time.

I did see some cached items showing up in the Joomla cache (not sure, maybe template related), so I looked for a "hard shutdown" option for the cache, and seemed to have found one:

forum.joomla.org/viewtopic.php?f=615&t=635868&view=previous

After changing the $cache_handler variable in the configuration.php file, nothing shows up in the cache. And so far I've not had any reports of the strange login behavior. (Though the site load performance has gone to ****)

Fingers crossed. Thanks again for all your help!