After I install the  kde-base/plasma-workspace-9999 , I started kde and found plasma said it crashed.
I create a panel by myself.It works well until I add the systemtray widget.So I think systemtray widget 
doesn't work.I has try many methods I found on the net such as remerge a lot of package or revdep-rebuild.When I emerge kde-base/plasma-workspace-9999 no errors is reported.I  still don't know why it happend.Now I install kde-base/plasma-workspace-4.9.5 and it works well.

Reproducible: Always

Steps to Reproduce:
1.Install all the 9999   kde-meta package 
2.start kdm
Actual Results:  
crash

Expected Results:  
fix it