access deny notification (BUG?)

Hi,
I have CBSUBS 3.0.0 on CB1.9 and Joomla 2.5.8
Sometimes happens that the notification "Access to this component not allowed without %s" appears, but everyting in the page is shown correctly. The strangeness is that, refreshing the same page, this notification sometimes appears and sometimes doesn't appear. And this behaviour happens for many pages.
I think this is a bug, but it's just my opinion.
Could someone help me?

Thank you

Are you protecting anything on the page you're trying to access? I'm guessing you've By Menu protection in place and are navigating to the page without an Itemid as the By Menu protection is Itemid based.

Hi,
no, I have not menu protected by plans. All menu are protected with Joomla ACL.
But what I want to underline is that the appearance of the access deny notification seems to be totally random and it appears even if everything in the page is shown correctly.
For instance, if I refresh the same page many times, sometimes the notification appears and sometimes it doesn't appear.
Why?

I've no idea, something is causing access protect to kick in and log the message to Joomlas message cache and Joomla then displays it on next page load. Maybe you're triggering it in another tab that's viewing your site and caused it to log a message?

Sorry, I didn't understand what you mean when you say "Maybe you're triggering it in another tab that's viewing your site and caused it to log a message". Could you explain better in other words?

And as for cache, in my website Joomla cache is disabled. There is some other kind of cache?

Sorry, I didn't understand what you mean when you say "Maybe you're triggering it in another tab that's viewing your site and caused it to log a message". Could you explain better in other words?

If you're reviewing your site in 2 browser tabs and 1 browser tab triggers access protection and you review the other tab it'll cause the message to show up, because Joomla caches messages stored to your session and displays on next page load.

There is some other kind of cache?

Nope, not unless something installed is caching.

Best I can suggest unpublish your CBSubs plans 1 by 1 until it goes away and that'll at least let you know what plan is causing it.