I have a recurring problem where I go to the last page of a topic and try to read the comments. I the end up with a blank screen i.e. no posts and have to return to the topic page and attempt to read the posts again.

Me too

we are looking into that, i never see this blank page, so if you can provide a link that would be great.

Just done it again this minute as i came onto site. went blank when i clicked on this topic, then when i clicked on back button and clicked again to come, on it worked