diff --git a/lib b/lib
index 9eb82a0cb..ba3e7e0d8 160000
--- a/lib
+++ b/lib
@@ -1 +1 @@
-Subproject commit 9eb82a0cb35cb0e6362d1b6ae555be1df299aa60
+Subproject commit ba3e7e0d883dc944dcc60dd7e806e1dcd2adddd3
diff --git a/src/ngscopeclient/MainWindow.cpp b/src/ngscopeclient/MainWindow.cpp
index f1b480a6c..04abeeebd 100644
--- a/src/ngscopeclient/MainWindow.cpp
+++ b/src/ngscopeclient/MainWindow.cpp
@@ -65,6 +65,7 @@
 #include "MetricsDialog.h"
 #include "MultimeterDialog.h"
 #include "PersistenceSettingsDialog.h"
+#include "PowerSupplyDialog.h"
 #include "PreferenceDialog.h"
 #include "ProtocolAnalyzerDialog.h"
 #include "RFGeneratorDialog.h"
@@ -202,6 +203,7 @@ void MainWindow::CloseSession()
 	m_fileBrowser = nullptr;
 	m_measurementsDialog = nullptr;
 	m_meterDialogs.clear();
+	m_psuDialogs.clear();
 	m_channelPropertiesDialogs.clear();
 	m_generatorDialogs.clear();
 	m_rfgeneratorDialogs.clear();
@@ -880,6 +882,10 @@ void MainWindow::OnDialogClosed(const std::shared_ptr<Dialog>& dlg)
 	if(meterDlg)
 		m_meterDialogs.erase(meterDlg->GetMeter());
 
+	auto psuDlg = dynamic_pointer_cast<PowerSupplyDialog>(dlg);
+	if(psuDlg)
+		m_psuDialogs.erase(psuDlg->GetPSU());
+
 	auto genDlg = dynamic_pointer_cast<FunctionGeneratorDialog>(dlg);
 	if(genDlg)
 		m_generatorDialogs.erase(genDlg->GetGenerator());
@@ -1940,6 +1946,14 @@ bool MainWindow::LoadSessionFromYaml(const YAML::Node& node, const string& dataD
 		return false;
 	}
 
+	//Update all of our instrument dialogs as needed
+	for(auto it : m_psuDialogs)
+	{
+		auto dlg = dynamic_pointer_cast<PowerSupplyDialog>(it.second);
+		if(dlg)
+			dlg->RefreshFromHardware();
+	}
+
 	//Load ImGui configuration
 	LogTrace("Loading ImGui configuration\n");
 	string ipath = dataDir + "/imgui.ini";
@@ -2482,6 +2496,7 @@ YAML::Node MainWindow::SerializeDialogs()
 		node["meters"] = mnode;
 	}
 
+	//TODO: psu dialogs
 	//TODO: generator dialogs
 	//TODO: rf generator dialogs
 	//TODO: SCPI console
diff --git a/src/ngscopeclient/MainWindow.h b/src/ngscopeclient/MainWindow.h
index 0748b967e..83c86f26b 100644
--- a/src/ngscopeclient/MainWindow.h
+++ b/src/ngscopeclient/MainWindow.h
@@ -279,6 +279,9 @@ class MainWindow : public VulkanWindow
 	///@brief Map of multimeters to meter control dialogs
 	std::map<SCPIMultimeter*, std::shared_ptr<Dialog> > m_meterDialogs;
 
+	///@brief Map of PSUs to power supply control dialogs
+	std::map<SCPIPowerSupply*, std::shared_ptr<Dialog> > m_psuDialogs;
+
 	///@brief Map of generators to generator control dialogs
 	std::map<SCPIFunctionGenerator*, std::shared_ptr<Dialog> > m_generatorDialogs;
 
diff --git a/src/ngscopeclient/MainWindow_Menus.cpp b/src/ngscopeclient/MainWindow_Menus.cpp
index be98b2703..e5b6c0e91 100644
--- a/src/ngscopeclient/MainWindow_Menus.cpp
+++ b/src/ngscopeclient/MainWindow_Menus.cpp
@@ -57,6 +57,7 @@
 #include "MetricsDialog.h"
 #include "MultimeterDialog.h"
 #include "PersistenceSettingsDialog.h"
+#include "PowerSupplyDialog.h"
 #include "PreferenceDialog.h"
 #include "ProtocolAnalyzerDialog.h"
 #include "RFGeneratorDialog.h"
@@ -75,6 +76,10 @@ void MainWindow::AddDialog(shared_ptr<Dialog> dlg)
 	if(mdlg != nullptr)
 		m_meterDialogs[mdlg->GetMeter()] = dlg;
 
+	auto pdlg = dynamic_cast<PowerSupplyDialog*>(dlg.get());
+	if(pdlg != nullptr)
+		m_psuDialogs[pdlg->GetPSU()] = dlg;
+
 	auto fdlg = dynamic_cast<FunctionGeneratorDialog*>(dlg.get());
 	if(fdlg != nullptr)
 		m_generatorDialogs[fdlg->GetGenerator()] = dlg;
diff --git a/src/ngscopeclient/PowerSupplyDialog.cpp b/src/ngscopeclient/PowerSupplyDialog.cpp
index fa935f3c2..59e34dfd1 100644
--- a/src/ngscopeclient/PowerSupplyDialog.cpp
+++ b/src/ngscopeclient/PowerSupplyDialog.cpp
@@ -53,10 +53,32 @@ PowerSupplyDialog::PowerSupplyDialog(SCPIPowerSupply* psu, shared_ptr<PowerSuppl
 	, m_psu(psu)
 	, m_state(state)
 {
-	//Set up initial empty state
+	AsyncLoadState();
+}
+
+PowerSupplyDialog::~PowerSupplyDialog()
+{
+	m_session->RemovePowerSupply(m_psu);
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// Rendering
+
+void PowerSupplyDialog::RefreshFromHardware()
+{
+	//pull settings again
+	AsyncLoadState();
+}
+
+void PowerSupplyDialog::AsyncLoadState()
+{
+	//Clear existing state (if any) and allocate space for new state
+	m_channelUIState.clear();
 	m_channelUIState.resize(m_psu->GetChannelCount());
 
-	//Asynchronously load rest of the state
+	//Do the async load
+	m_futureUIState.clear();
+	SCPIPowerSupply* psu = m_psu;
 	for(size_t i=0; i<m_psu->GetChannelCount(); i++)
 	{
 		//Add placeholders for non-power channels
@@ -70,14 +92,6 @@ PowerSupplyDialog::PowerSupplyDialog(SCPIPowerSupply* psu, shared_ptr<PowerSuppl
 	}
 }
 
-PowerSupplyDialog::~PowerSupplyDialog()
-{
-	m_session->RemovePowerSupply(m_psu);
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
-// Rendering
-
 bool PowerSupplyDialog::DoRender()
 {
 	//Device information
diff --git a/src/ngscopeclient/PowerSupplyDialog.h b/src/ngscopeclient/PowerSupplyDialog.h
index c1bdae22f..c3768a51f 100644
--- a/src/ngscopeclient/PowerSupplyDialog.h
+++ b/src/ngscopeclient/PowerSupplyDialog.h
@@ -89,8 +89,14 @@ class PowerSupplyDialog : public Dialog
 
 	virtual bool DoRender();
 
+	void RefreshFromHardware();
+
+	SCPIPowerSupply* GetPSU()
+	{ return m_psu; }
+
 protected:
 	void ChannelSettings(int i, float v, float a, float etime);
+	void AsyncLoadState();
 
 	///@brief Session handle so we can remove the PSU when closed
 	Session* m_session;
diff --git a/src/ngscopeclient/Session.cpp b/src/ngscopeclient/Session.cpp
index df4c821ca..96f80dde8 100644
--- a/src/ngscopeclient/Session.cpp
+++ b/src/ngscopeclient/Session.cpp
@@ -713,8 +713,11 @@ bool Session::LoadInstruments(int version, const YAML::Node& node, bool /*online
 		auto nick = inst["nick"].as<string>();
 		LogTrace("Loading instrument \"%s\"\n", nick.c_str());
 
-		reinterpret_cast<Instrument*>(m_idtable[inst["id"].as<uintptr_t>()])->LoadConfiguration(
-			version, inst, m_idtable);
+		auto pinst = reinterpret_cast<Instrument*>(m_idtable[inst["id"].as<uintptr_t>()]);
+		if(!pinst)
+			continue;
+
+		pinst->LoadConfiguration(version, inst, m_idtable);
 	}
 
 	return true;