It is a curious thing. It will not 'paint' the entire GUI of the effect you choose on the PC...hence a lot of grey shows up instead. Apparently it has been a repeatable bug so there will be a 'fix' for that once they figure out what it is that is causing that one...
In the meantime...if you find yourself staring at this wondering where in blazes LP67 is..close the project and reopen it..it appears in all its majesty...