diff --git a/retroshare-gui/src/gui/ChatLobbyWidget.cpp b/retroshare-gui/src/gui/ChatLobbyWidget.cpp
index 5fc3436e1..8bfb80a98 100644
--- a/retroshare-gui/src/gui/ChatLobbyWidget.cpp
+++ b/retroshare-gui/src/gui/ChatLobbyWidget.cpp
@@ -1,28 +1,33 @@
-#include <QTreeWidget>
-#include <QTextBrowser>
-#include <QTimer>
-#include <QMenu>
-#include <QMessageBox>
-#include <time.h>
-#include <algorithm>
+
 #include "ChatLobbyWidget.h"
-#include "chat/CreateLobbyDialog.h"
-#include "chat/ChatTabWidget.h"
-#include "common/RSTreeWidgetItem.h"
+
 #include "notifyqt.h"
 #include "chat/ChatLobbyDialog.h"
 #include "chat/ChatLobbyUserNotify.h"
-#include "util/HandleRichText.h"
-#include "util/QtVersion.h"
-#include "gui/settings/rsharesettings.h"
+#include "chat/ChatTabWidget.h"
+#include "chat/CreateLobbyDialog.h"
+#include "common/RSTreeWidgetItem.h"
 #include "gui/gxs/GxsIdDetails.h"
 #include "gui/Identity/IdEditDialog.h"
+#include "gui/settings/rsharesettings.h"
+#include "util/HandleRichText.h"
+#include "util/QtVersion.h"
 
 #include "retroshare/rsmsgs.h"
 #include "retroshare/rspeers.h"
 #include "retroshare/rsnotify.h"
 #include "retroshare/rsidentity.h"
 
+#include <QGridLayout>
+#include <QMenu>
+#include <QMessageBox>
+#include <QTextBrowser>
+#include <QTimer>
+#include <QTreeWidget>
+
+#include <algorithm>
+#include <time.h>
+
 //#define CHAT_LOBBY_GUI_DEBUG 1
 
 #define COLUMN_NAME       0
@@ -61,6 +66,8 @@ ChatLobbyWidget::ChatLobbyWidget(QWidget *parent, Qt::WindowFlags flags)
 
 	m_bProcessSettings = false;
 	myChatLobbyUserNotify = NULL;
+	myInviteYesButton = NULL;
+	myInviteIdChooser = NULL;
 
 	QObject::connect( NotifyQt::getInstance(), SIGNAL(lobbyListChanged()), SLOT(lobbyChanged()));
     QObject::connect( NotifyQt::getInstance(), SIGNAL(chatLobbyEvent(qulonglong,int,const RsGxsId&,const QString&)), this, SLOT(displayChatLobbyEvent(qulonglong,int,const RsGxsId&,const QString&)));
@@ -1081,8 +1088,8 @@ void ChatLobbyWidget::readChatLobbyInvites()
 	std::list<ChatLobbyId> subscribed_lobbies ;
 	rsMsgs->getChatLobbyList(subscribed_lobbies) ;
 
-    for(std::list<ChatLobbyInvite>::const_iterator it(invites.begin());it!=invites.end();++it)
-    {
+	for(std::list<ChatLobbyInvite>::const_iterator it(invites.begin());it!=invites.end();++it)
+	{
 		// first check if the lobby is already subscribed. If so, just ignore the request.
 
 		bool found = false ;
@@ -1097,8 +1104,8 @@ void ChatLobbyWidget::readChatLobbyInvites()
                        QMessageBox::Question, QMessageBox::Yes,QMessageBox::No, 0);
 
 
-        QLabel *label ;
-        GxsIdChooser *idchooser = new GxsIdChooser ;
+		QLabel *label;
+		GxsIdChooser *idchooser = new GxsIdChooser;
 
 		if( (*it).lobby_flags & RS_CHAT_LOBBY_FLAGS_PGP_SIGNED )
 		{
@@ -1110,18 +1117,24 @@ void ChatLobbyWidget::readChatLobbyInvites()
 			idchooser->loadIds(IDCHOOSER_ID_REQUIRED,default_id) ;
 			label = new QLabel(tr("Choose an identity for this chat room:"));
 		}
+		myInviteYesButton = mb.button(QMessageBox::Yes);
+		myInviteIdChooser = idchooser;
+		connect(idchooser, SIGNAL(currentIndexChanged(int)), this, SLOT(idChooserCurrentIndexChanged(int)));
+		idChooserCurrentIndexChanged(0);
 
-        QGridLayout* layout = qobject_cast<QGridLayout*>(mb.layout());
-        if (layout) {
-            layout->addWidget(label, layout->rowCount(), 0, 1, layout->columnCount(), Qt::AlignHCenter ) ;
-            layout->addWidget(idchooser, layout->rowCount(), 0, 1, layout->columnCount(), Qt::AlignRight ) ;
-        } else {
-            //Not QGridLayout so add at end
-            mb.layout()->addWidget(label) ;
-            mb.layout()->addWidget(idchooser) ;
-        }
+		QGridLayout* layout = qobject_cast<QGridLayout*>(mb.layout());
+		if (layout) {
+			layout->addWidget(label, layout->rowCount(), 0, 1, layout->columnCount(), Qt::AlignHCenter ) ;
+			layout->addWidget(idchooser, layout->rowCount(), 0, 1, layout->columnCount(), Qt::AlignRight ) ;
+		} else {
+			//Not QGridLayout so add at end
+			mb.layout()->addWidget(label) ;
+			mb.layout()->addWidget(idchooser) ;
+		}
 
-        int res = mb.exec() ;
+		int res = mb.exec();
+		myInviteYesButton = NULL;
+		myInviteIdChooser = NULL;
 
         if (res == QMessageBox::No)
         {
@@ -1144,6 +1157,28 @@ void ChatLobbyWidget::readChatLobbyInvites()
             std::cerr << "Can't join chat room with id 0x" << std::hex << (*it).lobby_id << std::dec << std::endl;
 
     }
+
+	myInviteYesButton = NULL;
+	myInviteIdChooser = NULL;
+}
+
+void ChatLobbyWidget::idChooserCurrentIndexChanged(int /*index*/)
+{
+	if (myInviteYesButton && myInviteIdChooser)
+	{
+		RsGxsId chosen_id;
+		switch (myInviteIdChooser->getChosenId(chosen_id))
+		{
+			case GxsIdChooser::KnowId:
+			case GxsIdChooser::UnKnowId:
+				myInviteYesButton->setEnabled(true);
+			break;
+			case GxsIdChooser::NoId:
+			case GxsIdChooser::None:
+			default: ;
+				myInviteYesButton->setEnabled(false);
+		}
+	}
 }
 
 void ChatLobbyWidget::filterColumnChanged(int)
diff --git a/retroshare-gui/src/gui/ChatLobbyWidget.h b/retroshare-gui/src/gui/ChatLobbyWidget.h
index dff4a9206..32b149dfb 100644
--- a/retroshare-gui/src/gui/ChatLobbyWidget.h
+++ b/retroshare-gui/src/gui/ChatLobbyWidget.h
@@ -1,10 +1,16 @@
 #pragma once
 
-#include <QTreeWidget>
-#include <retroshare/rsmsgs.h>
 #include "ui_ChatLobbyWidget.h"
+
 #include "RsAutoUpdatePage.h"
 #include "chat/ChatLobbyUserNotify.h"
+#include "gui/gxs/GxsIdChooser.h"
+
+
+#include <retroshare/rsmsgs.h>
+
+#include <QAbstractButton>
+#include <QTreeWidget>
 
 #define IMAGE_CHATLOBBY			    ":/icons/png/chat-lobbies.png"
 
@@ -82,6 +88,7 @@ private slots:
     void setShowSubscribeColumn(bool show);
 
 	void updateNotify(ChatLobbyId id, unsigned int count) ;
+	void idChooserCurrentIndexChanged(int index);
 
 private:
 	void autoSubscribeLobby(QTreeWidgetItem *item);
@@ -114,6 +121,9 @@ private:
 
 	ChatLobbyUserNotify* myChatLobbyUserNotify;
 
+	QAbstractButton* myInviteYesButton;
+	GxsIdChooser* myInviteIdChooser;
+
 	/* UI - from Designer */
 	Ui::ChatLobbyWidget ui;
 };
diff --git a/retroshare-gui/src/gui/gxs/GxsIdChooser.cpp b/retroshare-gui/src/gui/gxs/GxsIdChooser.cpp
index 303169182..e72da2c81 100644
--- a/retroshare-gui/src/gui/gxs/GxsIdChooser.cpp
+++ b/retroshare-gui/src/gui/gxs/GxsIdChooser.cpp
@@ -25,13 +25,14 @@
 #include "GxsIdDetails.h"
 #include "RsGxsUpdateBroadcastBase.h"
 #include "gui/Identity/IdEditDialog.h"
+#include "util/misc.h"
+
+#include <retroshare/rspeers.h>
 
 #include <QSortFilterProxyModel>
 #include <QStandardItemModel>
 #include <algorithm>
 
-#include <retroshare/rspeers.h>
-
 #include <iostream>
 
 #define ROLE_SORT Qt::UserRole + 1 // Qt::UserRole is reserved for data
@@ -247,7 +248,10 @@ uint32_t GxsIdChooser::countEnabledEntries() const
 void GxsIdChooser::loadPrivateIds()
 {
 	if (mFirstLoad) {
+		//whileBlocking doesn't work here.
+		bool prev = this->blockSignals(true);
 		clear();
+		this->blockSignals(prev);
 	}
 
 	std::list<RsGxsId> ids;