Make 2 macros
Turn Off Tooltips
/script GameTooltip.Temphide = function() GameTooltip:Hide() end; GameTooltip:SetScript("OnShow", GameTooltip.Temphide);
Turn On Tooltips
/script GameTooltip:SetScript("OnShow", GameTooltip.Show);
this will also fix WSG and EotS
Just use the turn off macro before going into HH or the pvp zones and turn it back on when you are finished. just a little work around until blizz fixes their buggy game.