Receiver upgrade on VDA to Citrix Workspace App will cause Grey Output from Webcam

In this scenario, the VDA 7.15 CU3 comes with Receiver 4.12 in the original installation. However, due to a security concern, the Receiver needed to be updated to Citrix Workspace 1912. After the update, when using the webcam, the camera is detected, but instead of the image, only a grey field is...