diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5e99b6151e..e983a6566c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -40,6 +40,10 @@ endif()
 #===============================================================================
 if(dagmc)
   find_package(DAGMC REQUIRED PATH_SUFFIXES lib/cmake)
+  if (${DAGMC_VERSION} VERSION_LESS 3.2.0)
+    message(FATAL_ERROR "Discovered DAGMC Version: ${DAGMC_VERSION}. \
+    Please update DAGMC to version 3.2.0 or greater.")
+  endif()
 endif()
 
 #===============================================================================
@@ -329,7 +333,7 @@ endif()
 # Avoid vs error lnk1149 :output filename matches input filename
 if(NOT MSVC)
 set_target_properties(libopenmc PROPERTIES
-  OUTPUT_NAME openmc) 
+  OUTPUT_NAME openmc)
 endif()
 
 target_include_directories(libopenmc
diff --git a/openmc/mgxs/mdgxs.py b/openmc/mgxs/mdgxs.py
index f511579528..7a139c7f87 100644
--- a/openmc/mgxs/mdgxs.py
+++ b/openmc/mgxs/mdgxs.py
@@ -2044,7 +2044,6 @@ class DecayRate(MDGXS):
                          num_delayed_groups)
         else:
             new_shape = (num_subdomains, num_delayed_groups)
-        new_shape += xs.shape[1:]
         xs = np.reshape(xs, new_shape)
 
         if squeeze:
diff --git a/openmc/mgxs_library.py b/openmc/mgxs_library.py
index e3c830c230..15ad54c43a 100644
--- a/openmc/mgxs_library.py
+++ b/openmc/mgxs_library.py
@@ -776,7 +776,7 @@ class XSdata:
         """
 
         # Get the accepted shapes for this xs
-        shapes = [self.xs_shapes["[DG]"], self.xs_shapes["[DG][G]"]]
+        shapes = [self.xs_shapes["[DG]"]]
 
         # Convert to a numpy array so we can easily get the shape for checking
         decay_rate = np.asarray(decay_rate)
diff --git a/src/dagmc.cpp b/src/dagmc.cpp
index 5c614e610f..362f9a6e48 100644
--- a/src/dagmc.cpp
+++ b/src/dagmc.cpp
@@ -66,7 +66,7 @@ bool get_uwuw_materials_xml(std::string& s) {
     ss << "<materials>\n";
     const auto& mat_lib = uwuw.material_library;
     // write materials
-    for (auto mat : mat_lib) { ss << mat.second.openmc("atom"); }
+    for (auto mat : mat_lib) { ss << mat.second->openmc("atom"); }
     // write footer
     ss << "</materials>";
     s = ss.str();
@@ -101,12 +101,15 @@ bool write_uwuw_materials_xml() {
   return found_uwuw_mats;
 }
 
-void legacy_assign_material(const std::string& mat_string, DAGCell* c)
+void legacy_assign_material(std::string mat_string, DAGCell* c)
 {
   bool mat_found_by_name = false;
   // attempt to find a material with a matching name
+  to_lower(mat_string);
   for (const auto& m : model::materials) {
-    if (mat_string == m->name_) {
+    std::string m_name = m->name();
+    to_lower(m_name);
+    if (mat_string == m_name) {
       // assign the material with that name
       if (!mat_found_by_name) {
         mat_found_by_name = true;
@@ -239,7 +242,7 @@ void load_dagmc_geometry()
         std::string uwuw_mat = DMD.volume_material_property_data_eh[vol_handle];
         if (uwuw.material_library.count(uwuw_mat) != 0) {
           // Note: material numbers are set by UWUW
-          int mat_number = uwuw.material_library[uwuw_mat].metadata["mat_number"].asInt();
+          int mat_number = uwuw.material_library.get_material(uwuw_mat).metadata["mat_number"].asInt();
           c->material_.push_back(mat_number);
         } else {
           fatal_error(fmt::format("Material with value {} not found in the "
diff --git a/tests/regression_tests/dagmc/refl/dagmc.h5m b/tests/regression_tests/dagmc/refl/dagmc.h5m
index ac788d2deb..26b2116847 100644
Binary files a/tests/regression_tests/dagmc/refl/dagmc.h5m and b/tests/regression_tests/dagmc/refl/dagmc.h5m differ
diff --git a/tests/regression_tests/dagmc/uwuw/dagmc.h5m b/tests/regression_tests/dagmc/uwuw/dagmc.h5m
index 4fbba3bb62..52570f64ac 100644
Binary files a/tests/regression_tests/dagmc/uwuw/dagmc.h5m and b/tests/regression_tests/dagmc/uwuw/dagmc.h5m differ
diff --git a/tests/regression_tests/mgxs_library_hdf5/results_true.dat b/tests/regression_tests/mgxs_library_hdf5/results_true.dat
index 4aa243b9e3..4a796b0a51 100644
--- a/tests/regression_tests/mgxs_library_hdf5/results_true.dat
+++ b/tests/regression_tests/mgxs_library_hdf5/results_true.dat
@@ -193,18 +193,10 @@ domain=1 type=beta
  [1.21876271e-04 8.77101834e-05]
  [4.95946084e-05 3.67414816e-05]]
 domain=1 type=decay-rate
-[[1.33568413e-02]
- [3.25887984e-02]
- [1.21105565e-01]
- [3.06139633e-01]
- [8.62763808e-01]
- [2.89789222e+00]]
-[[9.57055016e-04]
- [2.28222032e-03]
- [8.35436401e-03]
- [2.06734948e-02]
- [5.63019289e-02]
- [1.89486538e-01]]
+[1.33568413e-02 3.25887984e-02 1.21105565e-01 3.06139633e-01
+ 8.62763808e-01 2.89789222e+00]
+[9.57055016e-04 2.28222032e-03 8.35436401e-03 2.06734948e-02
+ 5.63019289e-02 1.89486538e-01]
 domain=1 type=delayed-nu-fission matrix
 [[[0.00000000e+00 0.00000000e+00]
   [0.00000000e+00 0.00000000e+00]]