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When Virtual Storage Console (VSC) and VASA Provider are registered to vCenter, UI (user interface) extensions are pulled to vSphere. These UI extensions represent the framework that VSC and VASA Provider use to display data.
When new versions of VSC or VASA Provider are released they may be bundled with new UI extensions. During the upgrade process, VSC does not have the ability to delete the old UI extensions off of the vCenter server. These files must be removed manually. If old UI extensions are not removed then a conflict may arise which can cause display issues with the plugin.
During a upgrade of VSC or VASA Provider, it is highly recommended that the old UI extensions be removed.