These are the top three reasons you may be unable to select the foreground/background when Primatte is applied to your clip:
- Primatte is not selected (Premiere only)
Click the words Primatte Keyer in the Effect Controls panel and try selecting your clip's foreground/background once again.
- Layer Controls are disabled (After Effects only)
Head into the View menu of After Effects and select Show Layer Controls, then try once more.
- File permission issues (Mac only)
Repair file permissions across your Mac using the Disk Utility program, then see if your issue persists. If it does, contact support for further instructions on how to repair file permissions on the directory where the plugin files get installed into, which varies per host/version.