Using VP17 on a VP15 project to grab a small section and rework it. I've added Vegas Brightness and Contrast and Color Curves. This items are enabled (checked) in the FX chain window, I close the fx window and reopen it and the items are unchecked. It still appears to be using the items but kind of unsettling as I don't know if it will save the project with then enabled or not and don't know what it is doing on renders until I view the output.
I tried to reproduce with a new project but haven't been able to yet.