Unfortunately, the 64-bit version of 3DMark11 doesn't currently work with PerfStudio. However (using v105), if you do a custom install, you can select and install the additional 32-bit components. What you need to do then is copy everything from C:\Program Files\Futuremark\3DMark11\bin\x86 to C:\Program Files (x86)\3DMark11\bin\x86 and create a shortcut to 3DMark11.exe in the x86 folder. You should then be able to drag this shortcut onto the 32-bit PerfStudio server.
When running the benchmark, make sure that just one of the tests in "selection" is checked. In the settings, check "Loop" and "Window Mode". When the benchmark loading screen is displayed, connect the client, and make sure that "Time Spoofing on pause" is set to "Freeze" from the client "Windows | Settings | General" page.
As far as Vantage goes, which version are you running? v113 is reporting as being DX10, which is no longer supported by PerfStudio.
Thanks,
Tony.