In VP10/12/13, if I click the "?" at the top right of a render Custom Settings window, I get a pop-up Plug-In Help window like this:
In VP14 and 15, if I click that "?", nothing happens.
I discovered this because I was searching the help files for "Allow source to adjust frame rate" and could find nothing because it's stored in these non-appearing help windows.
Could others please confirm this before I report it?