It varies with me, sometimes I have to double click several times and still not open and then right click and click on OPEN to get it to open. Like you, sometimes just double click and I can go get a cup of coffee and it still not open except for the advertisement header. I think they rigged in an auto delay so you have to spend several seconds reading the ads because those usually come on immediately but the forums hesitate for several seconds. Real PIA and waste of time to have to wait on some ad to play out, I guess they get more money for it if they make you look at it for 30 seconds each time you open a different thread.