Are there any other effects on that layer that affect contrast or lighting?
What release of After Effects, ProAnimator and operating system are you using?
Try sending a support package to our email: support@gridironsoftware.com and include a copy of the project (aep) file or a similar project that shows the same issue.
You can create a support package by going to the Nucleo icon (in the menu bar [Mac] or task tray [Windows]) and selecting Window > Support Tool. Select the Support tab, click Create and follow the instructions.
Chris
GridIron Software