we had a problem on our developing farm that force to re-install MS-project-server.
After running Configuration Wizard and reconfigure content-DB of SharePoint and reconfigure it install msps again and then create PWA. SharePoint and Project server is ok and the test is ok.
the problem appears after restart Server or IIS or everyday startup when calling http://server for example the white page appear without any prompt or correlation error.
but when we open in browser http://server/pwa everything return to healthy status. and a normal status.
I think the problem for application start on IIS that first site collection cant starts app pool (or cant start session start). but second (PWA) can do it.
extended web applications are ok.
PWA is ok. but only when restart IIS in the first request by browser open white page. and users force to call PWA URL
What is your suggestion and/or solution?