When I click on a forum or thread heading, sometimes it will be highlighted and sometimes not. I'd like to have this feature on all the time. Is there something I need to do here or is it a problem on my machine?

not sure what you mean by highlighted here.

At times when I click on a forum header or thread, it will be highlighted by a broken line. When returning to the thread or forum after reading the links, the headers will still be highligthed. This way its easy to remember the last forum or thread you read. Sometimes this doesn't work. I'm not much of a computer person, thats the best way I can describe it.