Old thread, but same blank output in Onyx.
Version Info
Onyx 2.1.4226.28167
VMware vSphere PowerCLI 5.0.1 build 581491
VMware AutoDeploy PowerCLI Component 5.0 build 544967
VMware ImageBuilder PowerCLI Component 5.0 build 544967
VMware vCloud Director PowerCLI Component 1.5 build 581492
VMware License PowerCLI Component 5.0 build 544881
VMware vSphere PowerCLI Component 5.0 build 581435
Tried Start Onyx -> Start PowerCLI (no output in Onyx)
Tried Start Onyx & start a PowerCLI connection (Launch Client) from Onyx (no output in Onyx)