Weird. Same thing just happened to me. You can fix it though. Once you are running RE7 and CE, added re7 to CE and dragged the script to CE, if you cannot do anything to it, then do this:
Right click on the script and on the list you get, put the mouse on top of "Group Config", then you get a new menu, once there left click on "Hide children when deactivated". You could also enable "Allow left and right to collapse and expand". Either way, it should fix it and you will be able to see the current FOV as well as edit it.
Also, once you have added the value for the FOV, make sure to tick the box on the middle, on the left, so that the FPS value doesn't change even if you have to reload.
Make sure that you are doing all this once you are in-game though, not on the game menu.
Also, be sure to get the new version of FOV Unlocker:
http://forum.cheatengine.org/download.php?id=120882