Created attachment 762 [details] patched version of G4OpWLS2.cc in line 339 of G4OpWLS2 G4OpticalParameters::Instance()->SetWLSTimeProfile(name); is called when it should be: G4OpticalParameters::Instance()->SetWLS2TimeProfile(name); that leads to the the values of the WLS wavelength shifting process to be overwritten.
This is now fixed in 11.1 (main) and 11.0.2 (patch) branches.