GPUView crash when opening .etl files

Hi,
I cannot open merged.etl with GPUView but I can open it with XPerf.
Even a simple capture with nothing special happening, just windows 7 64 bits running.
Any help would really be appreciated, I need to trace CPU/GPU sync.
I have installed wpt 64 bits from windows 7.1 SDK.

GPUView crashes here : 
GPUView.exe!00000000FF1689E0  cmp         qword ptr [r9+18h],rdx  (r9=1)

thanks.