Chrome recent update introduced a bug for HTML plugins running in the vSphere Flex client. APIs such as WEB_PLATFORM.getObjectId(), getActionUid(), getActionTargets() stop working (except for the very first time a plugin view is opened).
There is a simple fix that must be applied by all HTML plugins, change this line in web-platform.js
if (!WEB_PLATFORM) {
WEB_PLATFORM = self.parent.document.getElementById("container_app");
into
if (!WEB_PLATFORM) {
WEB_PLATFORM = Object.create(self.parent.document.getElementById("container_app"));
Again, this Chrome problem only affects HTML plugins running in the vSphere Flex client, not the new HTML client, but it is critical for all plugins to apply it.