REVERT, EDIT, DELETE, and DELETE ALL buttons may be grayed out when a snapshot is selected.VMware vCenter Server 8.0 U3 GA
VMware vCenter Server 8.0 U3a
This is a known issue caused by a missing date locale format. The extra zh-Hant localization data was not loaded, resulting in the absence of the short date format required by the VM snapshot details.
Upgrade vCenter Server to version 8.0 Update 3b or later. This issue has been resolved in vCenter Server 8.0U3b, refer to: VMware vCenter Server 8.0 Update 3b Release Notes.