Alright, you can download a custom build here: http://www.deftware.org/PixelCNC/PixelCNCv1.47aTrial(64bit).zip
Go ahead and place the EXE in your existing PixelCNC folder and run it instead of the existing "PixelCNC Trial.exe" file.
There's no guarantee that it will solve the problem but I made some changes that might fix the issue you're seeing. I also included some extra information output to the log file during startup that might help narrow things down, worst-case scenario, so if you're still seeing the INVALID OPERATION in the log file (or the console, just press the tilde '~' key to see the log output while in PixelCNC) then go ahead and pastebin the log file it produced so I can take another look.
Charlie
EDIT: I did some more digging and I think that this will solve the issue you were seeing! There's an issue with Intel's shader compiler that prevents it from supporting a certain math operation and the custom build above removes it.
EDIT2: If everything works for you as intended I'll get a public v1.47a hotfix update out today.