Problems with link buttons

[eeb]

I am having problems with the link buttons. If i'm in a thread, I can't reply with that buttons, only with the one in the main menu behind the subject.

Also sometimes, when the thread is longer than 1 page and I want to click page 2, I just return to thee main page.

Also, the pictures and buttons are not always how they should be; sometimes they appear as crosses and points...

Is it my computer, or more people have this?