RTC build definition is not up to date in RQM

Hello , 

We are using Jazz Server  6.0.4
And I think it was after upgraded from v5 to v6 ,   one of our project area got following issue.
In RQM,  the build definition and content are no longer updated. 
New RTC build definition or new build in the existing build definition are not displayed. 
I have checked build provider in RQM project property.   Tried to remove and add again. 
But it did not resolve this issue.

So we can no longer link test result to build.
Is there anything changed in v6 that I might need to update to enable this function again ?

Thanks!

Christine.