wall posts and comments not found

I have a real problem these days. I can't find some of my posts on my profile. If so, I don't find my friends' or my own comments on these posts. When I check my email I find loads of comments but when I click on the link I can't find them!!!
I sometimes try to log out and then log in or refresh the page to solve the problem. Sometimes it works but many times it doesn't! It's really getting me dissappointed!
I also tried the [You must be registered and logged in to see this link.] but it doesn't work neither!!

Please I need your help!
thanks in advance

Hello,

Try clearing your browser's cache and cookies, then restarting it

Hello Tim,

How can I do?!

Thanks

What browser & version are you using?

I'm actually using firefox mozila, version 3.6.16

Thanks

Thank you so much dear Tim! I'll try it. Hopefully it will work!