Average Generation Time Missing (no replies)

Hello Guys,

Thank you for the job to the Piwik Team, we find the tool very useful.
We have activated Piwik 2.6.2 for full java Java Web applications using standard JSP and while we go the page menu the avaerage generation time is missing for almost all the page displayed. Just a "-" is displayed on screen.
I wonder if there is something I missed during configuration on the client side.
I use JS tracker and just set page title variable, nothing more.