diff --git a/InterSpec/InterSpecServer.h b/InterSpec/InterSpecServer.h
index 8c6eeaf8..f63a6608 100644
--- a/InterSpec/InterSpecServer.h
+++ b/InterSpec/InterSpecServer.h
@@ -218,6 +218,9 @@ namespace InterSpecServer
    The file path must either be a file-system path to a spectrum file, or it can be a App URL with
    the schema "interspec://..."
    
+   Call #clear_file_to_open_on_load after you have succesfully handled the file to remove this request
+   and not accidentally request to load it later.
+   
    Throws exception if an invalid session token, or the session has already been loaded.
    */
   void set_file_to_open_on_load( const char *session_token, const std::string file_path );
@@ -227,6 +230,11 @@ namespace InterSpecServer
    Returns empty string if none.
    */
   std::string file_to_open_on_load( const std::string &session_token );
+  
+  /** Once you have loaded the file/url from #file_to_open_on_load, call this function to avoid
+   loading the file/url again later
+   */
+  void clear_file_to_open_on_load( const std::string &session_token );
 
 
 #if( BUILD_AS_ELECTRON_APP || BUILD_AS_OSX_APP || BUILD_AS_WX_WIDGETS_APP )
diff --git a/data/more_nuclide_info.xml b/data/more_nuclide_info.xml
index 3e179bbc..6357a5da 100644
--- a/data/more_nuclide_info.xml
+++ b/data/more_nuclide_info.xml
@@ -71,7 +71,7 @@ TODO: Need to incorporate the following from FRMAC Spectroscopists guide:
 
     <Ref key="FRMAC">
       <desc>FRMAC Gamma Spectroscopist Knowledge Guide. Revision 0., by Michael Enghauser. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States).</desc>
-      <url>https://www.hamamatsu.com/content/dam/hamamatsu-photonics/sites/documents/99_SALES_LIBRARY/etd/PMT_handbook_v3aE.pdf</url>
+      <url>https://www.osti.gov/servlets/purl/1763003</url>
       <date>20230311</date>
     </Ref>
 
diff --git a/src/GammaCountDialog.cpp b/src/GammaCountDialog.cpp
index d515fda1..ea9b5e97 100644
--- a/src/GammaCountDialog.cpp
+++ b/src/GammaCountDialog.cpp
@@ -32,14 +32,17 @@
 #include <Wt/WLabel>
 #include <Wt/WImage>
 #include <Wt/WGridLayout>
+#include <Wt/WPushButton>
+#include <Wt/WEnvironment>
 #include <Wt/WApplication>
 #include <Wt/WSelectionBox>
 #include <Wt/WDoubleSpinBox>
-#include <Wt/WPushButton>
 #include <Wt/WContainerWidget>
 
 
 #include "SpecUtils/SpecFile.h"
+#include "SpecUtils/StringAlgo.h"
+
 #include "InterSpec/SpecMeas.h"
 #include "InterSpec/AuxWindow.h"
 #include "InterSpec/InterSpec.h"
@@ -196,8 +199,20 @@ void GammaCountDialog::init()
 
   if( m_specViewer && !m_specViewer->isMobile() )
   {
-    WLabel* temp = new WLabel("<center><i><small>You can also <b>Shift-Alt-Drag</b> on the chart"
+    string key_sequence = "Shift-Alt-Drag";  // Linux / Windows
+    const string &user_agent = wApp->environment().userAgent();
+    if( SpecUtils::icontains( user_agent, "macos")
+       || SpecUtils::icontains( user_agent, "macintel")
+       || SpecUtils::icontains( user_agent, "macintosh")
+       || SpecUtils::icontains( user_agent, "iphone")
+       || SpecUtils::icontains( user_agent, "ipad") )
+    {
+      key_sequence = "Shift-Option-Drag"; //Apple
+    }
+    
+    WLabel* temp = new WLabel("<center><i><small>You can also <b>" + key_sequence + "</b> on the chart"
                               " to select the energy range</small></i></center>");
+    
     temp->setWordWrap(true);
     layout->addWidget(temp,++row, 0 , 1 ,3,AlignCenter);
     temp->setStyleClass("line-below");
diff --git a/src/InterSpecApp.cpp b/src/InterSpecApp.cpp
index 54599d15..66bc5854 100644
--- a/src/InterSpecApp.cpp
+++ b/src/InterSpecApp.cpp
@@ -534,12 +534,13 @@ void InterSpecApp::setupWidgets( const bool attemptStateLoad  )
   const Http::ParameterMap &parmap = environment().getParameterMap();
   
 #if( !BUILD_FOR_WEB_DEPLOYMENT )
-  if( !m_externalToken.empty() )
+  // The check of `attemptStateLoad` isnt strickly needed, as #file_to_open_on_load contents
+  //  will be cleared
+  if( attemptStateLoad && !m_externalToken.empty() )
   {
     const string initial_file = InterSpecServer::file_to_open_on_load( m_externalToken );
     if( !initial_file.empty() )
     {
-      
       if( SpecUtils::istarts_with(initial_file, "interspec://")
          || SpecUtils::istarts_with(initial_file, "RADDATA://G0/") )
       {
@@ -556,6 +557,8 @@ void InterSpecApp::setupWidgets( const bool attemptStateLoad  )
       {
         loadedSpecFile = m_viewer->userOpenFileFromFilesystem( initial_file );
       }//if( SpecUtils::istarts_with(foregroundPath, "interspec://") )
+     
+      InterSpecServer::clear_file_to_open_on_load( m_externalToken );
       
       if( loadedSpecFile )
       {
diff --git a/src/InterSpecServer.cpp b/src/InterSpecServer.cpp
index 9c8fdd4c..e7132e0b 100644
--- a/src/InterSpecServer.cpp
+++ b/src/InterSpecServer.cpp
@@ -907,6 +907,15 @@ std::string file_to_open_on_load( const std::string &session_token )
 }//file_to_open_on_load(...)
 
 
+void clear_file_to_open_on_load( const std::string &session_token )
+{
+  lock_guard<mutex> lock( ns_sessions_mutex );
+  auto pos = ns_sessions.find( session_token );
+  if( pos != end(ns_sessions) )
+    ns_sessions.erase( pos );
+}//void clear_file_to_open_on_load( const std::string &session_token )
+  
+  
 #if( BUILD_AS_ELECTRON_APP || BUILD_AS_OSX_APP || BUILD_AS_WX_WIDGETS_APP )
 
   
diff --git a/src/ReferencePhotopeakDisplay.cpp b/src/ReferencePhotopeakDisplay.cpp
index 17c81201..58c07d02 100644
--- a/src/ReferencePhotopeakDisplay.cpp
+++ b/src/ReferencePhotopeakDisplay.cpp
@@ -1356,7 +1356,6 @@ void ReferencePhotopeakDisplay::handleIsotopeChange( const bool useCurrentAge )
   
   try
   {
-    
     if( nuc && !nuc->isStable() && !nuc->decaysToChildren.empty() && !useCurrentAge )
     {
       if( nuc->decaysToStableChildren() )
@@ -1370,8 +1369,8 @@ void ReferencePhotopeakDisplay::handleIsotopeChange( const bool useCurrentAge )
         m_ageEdit->setText( hlstr );
       }else if( m_currentlyShowingNuclide.m_input.m_input_txt != nuc->symbol )
       {
-        string agestr;
-        PeakDef::defaultDecayTime( nuc, &agestr );
+        string defagestr;
+        PeakDef::defaultDecayTime( nuc, &defagestr );
         m_ageEdit->setText( agestr );
       }else
       {
@@ -1382,9 +1381,15 @@ void ReferencePhotopeakDisplay::handleIsotopeChange( const bool useCurrentAge )
       }//if( nuc->decaysToStableChildren() ) / else
     }else if( nuc && useCurrentAge )
     {
-      double age = PhysicalUnits::stringToTimeDurationPossibleHalfLife( agestr, nuc->halfLife );
-      if( age > 100.0*nuc->halfLife || age < 0.0 )
-        throw std::runtime_error( "" );
+      if( agestr.empty() && nuc->decaysToStableChildren() )
+      {
+        // We dont need an age - we will set to zero - so dont throw exception from empty string
+      }else
+      {
+        double age = PhysicalUnits::stringToTimeDurationPossibleHalfLife( agestr, nuc->halfLife );
+        if( age > 100.0*nuc->halfLife || age < 0.0 )
+          throw std::runtime_error( "" );
+      }
     }
   }catch(...)
   {