Why am I denied access to some posts?

I'm not one of the members who seems to have no life outside this forum, but I do check in a couple times a week and I've made 35 posts and do try to contribute in meaningful ways. Why do I get these messages?

"#4Buck, you do not have permission to access this page. This could be due to one of several reasons:"

No, I'm not trying to edit and as far as I know I haven't been censured for anything. I've made more than five posts. The posts I was blocked from viewing today were subjects that came on the list of recent topics that shows up as an email from the forum.

Any thoughts?

Thanks

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Why am I denied access to some posts?