fixed photon_production issue. Problem was that the particle event_, event_nuclide_ and event_mt_ variables were not being set at beginning of XS lookup event.

src/simulation.cpp

@@ -203,6 +203,11 @@ void process_calculate_xs_events(QueueItem * queue, int n)
     p->E_last_ = p->E_;
     p->u_last_ = p->u();
     p->r_last_ = p->r();
+    
+    // Reset event variables
+    p->event_ = EVENT_KILL;
+    p->event_nuclide_ = NUCLIDE_NONE;
+    p->event_mt_ = REACTION_NONE;
 
     // If the cell hasn't been determined based on the particle's location,
     // initiate a search for the current cell. This generally happens at the

tests/regression_tests/photon_production/inputs_true.dat

@@ -34,7 +34,6 @@
   <cutoff>
     <energy_photon>1000.0</energy_photon>
   </cutoff>
-  <verbosity>10</verbosity>
 </settings>
 <?xml version='1.0' encoding='utf-8'?>
 <tallies>

tests/regression_tests/photon_production/test.py

@@ -44,7 +44,6 @@ class SourceTestHarness(PyAPITestHarness):
         settings.electron_treatment = 'ttb'
         settings.cutoff = {'energy_photon' : 1000.0}
         settings.source = source
-        settings.verbosity = 10
         settings.export_to_xml()
 
         surface_filter = openmc.SurfaceFilter(cyl)