If you are running vCenter 6.0 Update 1, you might have seen the following error.

Error occurred while processing request. Check vSphere WebClient logs for details.

This error is most likely caused by a bug introduced in vCenter 6.0U1, affecting the Customer Experience Improvement Program.

You can confirm this by browsing in the vSphere Web Client to Administration -> Customer Experience Improvement Program.

Based on VMware’s release notes for vCenter 6.0 Update 2, this issue should have been fixed but I still see it. However, it is less frequent now.

When you log into vSphere Web Client, the Customer Experience Improvement Program might report an error message
When you log in to vSphere Web Client, the Customer Experience Improvement Program might fail, and report an error message similar to the following:
Error occurred while processing request. Check vsphere Web client Logs for details.

This issue is seen in vSphere Web Client Update 1 and above.

This issue is resolved in this release.

Details can be found here. As far as I am aware of, this bug is not affecting anything critical in the vSphere Web Client and is mainly an annoyance.

This isn’t the first time VMware is causing us some annoyance but all we can do is hope for the vSphere Web Client to become more reliable.