please share your file so it’s easier to try with.
I note that you have in your input panel writeControl and writeInterval, perhaps for cuttingPlane function you need to replace with:
outputControl timeStep;
outputInterval 2;
(have a look here http://openfoambuilder.org/functionobjects.php#cuttingplanesampling )
I just wonder if that’s conflicting with writeControl and writeInterval of the controldict.
Best
Olivier