I know that this post is somehow old!! but I want to share my experience for those who did not find this solution a proper one.
We have 2 vCenters that are connected to each other (PSC Linked) and one of them had this problem (specifically talking, the problem was with the HTML5 version of VC but not with Flex version). so I compared almost everything (vSphere-ui files and services) between these two VCs and realized that there is a file at this path "/etc/vmware/vsphere-ui/cmCatalog" which is different from the one at the healthy vCenter. The file name was "com.vmware.cis.vcenterserver", and the difference was the size of files, one of them was almost 5MB and another one (the corrupted one) was 1KB. so we replaced the corrupted one with the other one and restarted the vSphere Web Client service. The problem has gone!
I hope this could be an alternative solution for you guys.
cheers
