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I'm sorry to hear that you're having this problem, Gord. There are two things that could cause this. First, it could be that you have conversations turned off; that might cause what you're seeing. To learn how to do turn Conversations off or on, please have a look at the following Yahoo Mail Help article:
http://help.yahoo.com/kb/index?page=content&y=PROD_MAIL_ML&locale=en_US&id=SLN15805
The other thing that might cause this is a problem with your Web browser (for instance, if it needs to be updated). I recommend reading the following Yahoo Mail Help article "Fix browser and feature problems on Yahoo" for steps you can take to fix the majority of problems you may encounter with your Web browser. You can find the link to it below.
http://help.yahoo.com/kb/index?page=content&id=SLN2891&locale=en_US&y=PROD_ACCT
I hope you find this helpful!
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