Why are the threads staying blue,they usually turn red after I've read them,now I can't tell what ones I opened because their staying blue.Did I do something wrong!!!

 

What browser and version are you using? The feature you describe works in part by your browser knowing what content you've clicked on. So the issue is likely with your browser. The simple, fast, suggestion would be to clear your browser's cache and restart. If the issue continues, then there may be a problem with your browser or you're using a 3rd party security software that is interfering with your browser's history tracking.