PUGH has a poisoning parameter which can initialise grid variables to NaN. The default is "none" which leaves grid variables uninitialised. If the default is changed to NaN, several tests fail, indicating that they are failing to initialise their data correctly. The tests which fail are:
tov_slowsector (from GRHydro) TestComplex (from TestComplex) gaussian (from WaveMoL)
The tests fail on both 1 and 2 processes.
All report differences related to NaNs apart from tov_slowsector. Possibly there is some NaN-filtering going on there. The test passes without PUGH poisoning. Tests were performed on Datura.