Yahoo mail can't attach files?

I've tried two or three different addresses and 2 or 3 different files to attach and Yahoo Mail just sits there. It will not attach. I had to use my AOL address on this same computer. BTW, it is an 8mb video Mpeg4 and WMV formats
Update: I wrote this long ago, this thing never dies. No obvious way to kill it!
Update 2: I don't know how to delete this question but I wish it would go away.
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