Hi. I was going to tell you I just read something about this on Crackberry, but now that I went back and reread, you probably already know that.
All I can think of is to go to verizon.blackberry.com, and open up your Yahoo account there (click on Edit) and check the filters and other settings. Are you getting your Yahoo emails on your home computer? If not, I would contact them.
And just for fun, you could try a battery pull to reset everything.
Hope it's resolved soon!
First try this solution:
Re-validate the integrated account. To do this, complete the following steps:
If you are still having the issue then you would go thru steps of :
The steps are located at this web address http://www.blackberry.com/btsc/dynamickc.do?externalId=KB02189&sliceId=SAL_Public&command=show&forwa...
Hope this Helps