I have just downloaded Yahoo for Verizon.
The browser that comes with Yahoo closes when using any menu such as Tools or Help or with any right click. Unloading Window Blinds fixes the problem.
I have the Verizon Fios ( Fiber Optic Connection ) which is super fast so that stays.
The regular Explorer Browser works OK.
I know I can work around this problem but sure would like to keep my Window Blinds running and use the new Browser.