Hi there, please be sure you are on the latest version of CAM from camwebapp.com. The most current version is 3.5.3
The overlay requires DirectX Runtime to be installed.
Please install DX Runtime and then restart your PC and see if the overlay works. The link below will take you to the download site for the installer.
Also make sure that you have tried manually enabling the overlay with the short keys (Shift + O). These shortcut keys can be changed from settings in CAM as well.
If the instructions above does not work please let us know which games the overlay is not working on.Anonymous commented
This program is bust i suggest using msi afterburner with statistics downloaded with it and it shows everything in game.