diff --git a/nexus/tests/reference/user_examples/qmcpack/rsqmc_misc/H2O/runs/dmc.in.xml b/nexus/tests/reference/user_examples/qmcpack/rsqmc_misc/H2O/runs/dmc.in.xml
index 761506463..87d030f48 100644
--- a/nexus/tests/reference/user_examples/qmcpack/rsqmc_misc/H2O/runs/dmc.in.xml
+++ b/nexus/tests/reference/user_examples/qmcpack/rsqmc_misc/H2O/runs/dmc.in.xml
@@ -2,6 +2,7 @@
 <simulation>
    <project id="dmc" series="0">
       <application name="qmcpack" role="molecu" class="serial" version="1.0"/>
+      <parameter name="driver_version"> legacy </parameter>
    </project>
    <qmcsystem>
       <simulationcell>
diff --git a/nexus/tests/reference/user_examples/qmcpack/rsqmc_misc/H2O/runs/opt.in.xml b/nexus/tests/reference/user_examples/qmcpack/rsqmc_misc/H2O/runs/opt.in.xml
index a79aeb2b7..7452d0529 100644
--- a/nexus/tests/reference/user_examples/qmcpack/rsqmc_misc/H2O/runs/opt.in.xml
+++ b/nexus/tests/reference/user_examples/qmcpack/rsqmc_misc/H2O/runs/opt.in.xml
@@ -2,6 +2,7 @@
 <simulation>
    <project id="opt" series="0">
       <application name="qmcpack" role="molecu" class="serial" version="1.0"/>
+      <parameter name="driver_version"> legacy </parameter>
    </project>
    <qmcsystem>
       <simulationcell>
diff --git a/nexus/tests/reference/user_examples/qmcpack/rsqmc_misc/LiH/runs/dmc.in.xml b/nexus/tests/reference/user_examples/qmcpack/rsqmc_misc/LiH/runs/dmc.in.xml
index 515f6ec9f..3c8d0ccbb 100644
--- a/nexus/tests/reference/user_examples/qmcpack/rsqmc_misc/LiH/runs/dmc.in.xml
+++ b/nexus/tests/reference/user_examples/qmcpack/rsqmc_misc/LiH/runs/dmc.in.xml
@@ -2,6 +2,7 @@
 <simulation>
    <project id="dmc" series="0">
       <application name="qmcpack" role="molecu" class="serial" version="1.0"/>
+      <parameter name="driver_version"> legacy </parameter>
    </project>
    <qmcsystem>
       <simulationcell>
diff --git a/nexus/tests/reference/user_examples/qmcpack/rsqmc_misc/LiH/runs/opt.in.xml b/nexus/tests/reference/user_examples/qmcpack/rsqmc_misc/LiH/runs/opt.in.xml
index 725162ca9..696c01d71 100644
--- a/nexus/tests/reference/user_examples/qmcpack/rsqmc_misc/LiH/runs/opt.in.xml
+++ b/nexus/tests/reference/user_examples/qmcpack/rsqmc_misc/LiH/runs/opt.in.xml
@@ -2,6 +2,7 @@
 <simulation>
    <project id="opt" series="0">
       <application name="qmcpack" role="molecu" class="serial" version="1.0"/>
+      <parameter name="driver_version"> legacy </parameter>
    </project>
    <qmcsystem>
       <simulationcell>
diff --git a/nexus/tests/reference/user_examples/qmcpack/rsqmc_misc/c20/runs/c20/opt/opt.in.xml b/nexus/tests/reference/user_examples/qmcpack/rsqmc_misc/c20/runs/c20/opt/opt.in.xml
index 8b36a5c13..ea726f2ac 100644
--- a/nexus/tests/reference/user_examples/qmcpack/rsqmc_misc/c20/runs/c20/opt/opt.in.xml
+++ b/nexus/tests/reference/user_examples/qmcpack/rsqmc_misc/c20/runs/c20/opt/opt.in.xml
@@ -2,6 +2,7 @@
 <simulation>
    <project id="opt" series="0">
       <application name="qmcpack" role="molecu" class="serial" version="1.0"/>
+      <parameter name="driver_version"> legacy </parameter>
    </project>
    <qmcsystem>
       <simulationcell>
diff --git a/nexus/tests/reference/user_examples/qmcpack/rsqmc_misc/c20/runs/c20/qmc/qmc.in.xml b/nexus/tests/reference/user_examples/qmcpack/rsqmc_misc/c20/runs/c20/qmc/qmc.in.xml
index 8ca11f56e..76e07d4d9 100644
--- a/nexus/tests/reference/user_examples/qmcpack/rsqmc_misc/c20/runs/c20/qmc/qmc.in.xml
+++ b/nexus/tests/reference/user_examples/qmcpack/rsqmc_misc/c20/runs/c20/qmc/qmc.in.xml
@@ -2,6 +2,7 @@
 <simulation>
    <project id="qmc" series="0">
       <application name="qmcpack" role="molecu" class="serial" version="1.0"/>
+      <parameter name="driver_version"> legacy </parameter>
    </project>
    <qmcsystem>
       <simulationcell>
diff --git a/nexus/tests/reference/user_examples/qmcpack/rsqmc_misc/diamond/runs/diamond/vmc/vmc.in.xml b/nexus/tests/reference/user_examples/qmcpack/rsqmc_misc/diamond/runs/diamond/vmc/vmc.in.xml
index 995f7c385..4cfe98d58 100644
--- a/nexus/tests/reference/user_examples/qmcpack/rsqmc_misc/diamond/runs/diamond/vmc/vmc.in.xml
+++ b/nexus/tests/reference/user_examples/qmcpack/rsqmc_misc/diamond/runs/diamond/vmc/vmc.in.xml
@@ -2,6 +2,7 @@
 <simulation>
    <project id="vmc" series="0">
       <application name="qmcpack" role="molecu" class="serial" version="1.0"/>
+      <parameter name="driver_version"> legacy </parameter>
    </project>
    <qmcsystem>
       <simulationcell>
diff --git a/nexus/tests/reference/user_examples/qmcpack/rsqmc_misc/graphene/runs/graphene/opt/opt.in.xml b/nexus/tests/reference/user_examples/qmcpack/rsqmc_misc/graphene/runs/graphene/opt/opt.in.xml
index f6e3d3d4d..6956fba55 100644
--- a/nexus/tests/reference/user_examples/qmcpack/rsqmc_misc/graphene/runs/graphene/opt/opt.in.xml
+++ b/nexus/tests/reference/user_examples/qmcpack/rsqmc_misc/graphene/runs/graphene/opt/opt.in.xml
@@ -2,6 +2,7 @@
 <simulation>
    <project id="opt" series="0">
       <application name="qmcpack" role="molecu" class="serial" version="1.0"/>
+      <parameter name="driver_version"> legacy </parameter>
    </project>
    <qmcsystem>
       <simulationcell>
diff --git a/nexus/tests/reference/user_examples/qmcpack/rsqmc_misc/graphene/runs/graphene/qmc/qmc.in.xml b/nexus/tests/reference/user_examples/qmcpack/rsqmc_misc/graphene/runs/graphene/qmc/qmc.in.xml
index adf59c1b6..46f81d5f0 100644
--- a/nexus/tests/reference/user_examples/qmcpack/rsqmc_misc/graphene/runs/graphene/qmc/qmc.in.xml
+++ b/nexus/tests/reference/user_examples/qmcpack/rsqmc_misc/graphene/runs/graphene/qmc/qmc.in.xml
@@ -2,6 +2,7 @@
 <simulation>
    <project id="qmc" series="0">
       <application name="qmcpack" role="molecu" class="serial" version="1.0"/>
+      <parameter name="driver_version"> legacy </parameter>
    </project>
    <qmcsystem>
       <simulationcell>
diff --git a/nexus/tests/reference/user_examples/qmcpack/rsqmc_misc/oxygen_dimer/scale_1.0/opt.in.xml b/nexus/tests/reference/user_examples/qmcpack/rsqmc_misc/oxygen_dimer/scale_1.0/opt.in.xml
index 25d7546c2..3b8ef1068 100644
--- a/nexus/tests/reference/user_examples/qmcpack/rsqmc_misc/oxygen_dimer/scale_1.0/opt.in.xml
+++ b/nexus/tests/reference/user_examples/qmcpack/rsqmc_misc/oxygen_dimer/scale_1.0/opt.in.xml
@@ -2,6 +2,7 @@
 <simulation>
    <project id="opt" series="0">
       <application name="qmcpack" role="molecu" class="serial" version="1.0"/>
+      <parameter name="driver_version"> legacy </parameter>
    </project>
    <qmcsystem>
       <simulationcell>
diff --git a/nexus/tests/reference/user_examples/qmcpack/rsqmc_misc/oxygen_dimer/scale_1.0/qmc.in.xml b/nexus/tests/reference/user_examples/qmcpack/rsqmc_misc/oxygen_dimer/scale_1.0/qmc.in.xml
index f903704c5..d1dcf28d8 100644
--- a/nexus/tests/reference/user_examples/qmcpack/rsqmc_misc/oxygen_dimer/scale_1.0/qmc.in.xml
+++ b/nexus/tests/reference/user_examples/qmcpack/rsqmc_misc/oxygen_dimer/scale_1.0/qmc.in.xml
@@ -2,6 +2,7 @@
 <simulation>
    <project id="qmc" series="0">
       <application name="qmcpack" role="molecu" class="serial" version="1.0"/>
+      <parameter name="driver_version"> legacy </parameter>
    </project>
    <qmcsystem>
       <simulationcell>