diff --git a/org.adempiere.base/src/org/compiere/model/MClient.java b/org.adempiere.base/src/org/compiere/model/MClient.java
index 4a6a020c1f..4acd6b10fb 100644
--- a/org.adempiere.base/src/org/compiere/model/MClient.java
+++ b/org.adempiere.base/src/org/compiere/model/MClient.java
@@ -362,7 +362,13 @@ public class MClient extends X_AD_Client
 					success = tree.save();
 					AD_Tree_Activity_ID = tree.getAD_Tree_ID();
 				}
-				else if (value.equals(X_AD_Tree.TREETYPE_Menu))	//	No Menu
+				else if (   value.equals(X_AD_Tree.TREETYPE_Menu)	//	No Menu
+						 || value.equals(X_AD_Tree.TREETYPE_Table)	//	No Custom Table
+						 || value.equals(X_AD_Tree.TREETYPE_User1)	//	No custom user trees
+						 || value.equals(X_AD_Tree.TREETYPE_User2)
+						 || value.equals(X_AD_Tree.TREETYPE_User3)
+						 || value.equals(X_AD_Tree.TREETYPE_User4)
+						)
 					success = true;
 				else	//	PC (Product Category), BB (BOM)
 				{
diff --git a/org.adempiere.base/src/org/compiere/model/PO.java b/org.adempiere.base/src/org/compiere/model/PO.java
index 51012d1ca4..bf1b1222e9 100644
--- a/org.adempiere.base/src/org/compiere/model/PO.java
+++ b/org.adempiere.base/src/org/compiere/model/PO.java
@@ -4705,7 +4705,7 @@ public abstract class PO
 	}
 
 	private void checkValidContext() {
-		if (getCtx().size() == 0)
+		if (getCtx().isEmpty() && getCtx().getProperty("#AD_Client_ID") == null)
 			throw new AdempiereException("Context lost");
 	}
 
diff --git a/org.adempiere.server-feature/product.ant b/org.adempiere.server-feature/product.ant
index c2829b81af..d6d7b83fcd 100644
--- a/org.adempiere.server-feature/product.ant
+++ b/org.adempiere.server-feature/product.ant
@@ -20,7 +20,7 @@
 		<echo message="${equinox.launcher.jar}"/>
 		<echo message="${repository}"/>
 		<echo message="${destination}"/>
-		<java jar="${equinox.launcher.jar}" fork="true" failonerror="true" >
+		<java outputproperty="javaoutput" resultproperty="javaresult" jar="${equinox.launcher.jar}" fork="true" failonerror="false" >
 			<arg value="-application"/>
 			<arg value="org.eclipse.equinox.p2.director"/>
 			<arg value="-repository"/>
@@ -43,5 +43,16 @@
 			<arg value="-roaming"/>
 			<!-- jvmarg value="-agentlib:jdwp=transport=dt_socket,address=8000,server=y,suspend=y"/ -->
 		</java>
+		<!-- IDEMPIERE-1618: This block gives an error message on console. Else errors here are hard 
+		     to identify for unexperienced users because the java runs in a fork and gives no output to
+		     stdout. Messages are still in the latest logfile in ECLIPSE_HOME/configuration 
+		     (or buckminster) - thanks to CarlosRuiz for this hint.
+		     -->
+		<echo message="${javaresult}" />
+		<fail message="result: ${javaresult}\n${javaoutput}">
+			<condition>
+				<not><equals arg1="${javaresult}" arg2="0"/></not>
+			</condition>
+		</fail>
 	</target>
-</project>
\ No newline at end of file
+</project>
diff --git a/org.adempiere.ui.swing-feature/product.ant b/org.adempiere.ui.swing-feature/product.ant
index f302877d73..a4e581c000 100644
--- a/org.adempiere.ui.swing-feature/product.ant
+++ b/org.adempiere.ui.swing-feature/product.ant
@@ -20,7 +20,7 @@
 		<echo message="${equinox.launcher.jar}"/>
 		<echo message="${repository}"/>
 		<echo message="${destination}"/>
-		<java jar="${equinox.launcher.jar}" fork="true" failonerror="true" >
+		<java outputproperty="javaoutput" resultproperty="javaresult" jar="${equinox.launcher.jar}" fork="true" failonerror="false" >
 			<arg value="-application"/>
 			<arg value="org.eclipse.equinox.p2.director"/>
 			<arg value="-repository"/>
@@ -43,5 +43,16 @@
 			<arg value="-roaming"/>
 			<!-- jvmarg value="-agentlib:jdwp=transport=dt_socket,address=8000,server=y,suspend=y"/ -->
 		</java>
+		<!-- IDEMPIERE-1618: This block gives an error message on console. Else errors here are hard 
+		     to identify for unexperienced users because the java runs in a fork and gives no output to
+		     stdout. Messages are still in the latest logfile in ECLIPSE_HOME/configuration 
+		     (or buckminster) - thanks to CarlosRuiz for this hint.
+		     -->
+		<echo message="${javaresult}" />
+		<fail message="result: ${javaresult}\n${javaoutput}">
+			<condition>
+				<not><equals arg1="${javaresult}" arg2="0"/></not>
+			</condition>
+		</fail>
 	</target>
 </project>
\ No newline at end of file
diff --git a/org.idempiere.webservices/WEB-INF/src/org/idempiere/adinterface/CompiereService.java b/org.idempiere.webservices/WEB-INF/src/org/idempiere/adinterface/CompiereService.java
index bd01f4651f..75f04413ea 100644
--- a/org.idempiere.webservices/WEB-INF/src/org/idempiere/adinterface/CompiereService.java
+++ b/org.idempiere.webservices/WEB-INF/src/org/idempiere/adinterface/CompiereService.java
@@ -39,8 +39,6 @@ public class CompiereService {
 
 	private static CLogger	log = CLogger.getCLogger(CompiereService.class);
 
-	private Properties m_ctx; 
-	
 	private int m_AD_Client_ID;
 	private int m_AD_Org_ID;
 	private int m_AD_User_ID;
@@ -92,7 +90,7 @@ public class CompiereService {
 	 * @return context of current request
 	 */
 	public Properties getCtx() {
-		return m_ctx;
+		return Env.getCtx();
 	}
 
 	/**
@@ -113,11 +111,10 @@ public class CompiereService {
 		{
 			CompiereUtil.initWeb();
 			
-			m_ctx = new Properties();
 			m_connected = true;
 			
-			ServerContext.setCurrentInstance(m_ctx);
-			Env.setContext( m_ctx, "#AD_Language", "en_US" );
+			ServerContext.setCurrentInstance(new Properties());
+			Env.setContext(getCtx(), "#AD_Language", "en_US" );
 			m_language = Language.getLanguage("en_US");
 			
 			dateFormat = DisplayType.getDateFormat(DisplayType.Date, m_language);
@@ -138,7 +135,6 @@ public class CompiereService {
 		{
 			Env.logout();
 			ServerContext.dispose();
-			m_ctx = null;
 			m_loggedin = false;
 			m_connected = false;
 		}
@@ -255,7 +251,7 @@ public class CompiereService {
 		m_locale = Lang;
 		m_userName = MUser.getNameOfUser(m_AD_User_ID);
 		
-		Env.setContext( m_ctx, "#AD_Language", Lang);
+		Env.setContext( getCtx(), "#AD_Language", Lang);
 		m_language = Language.getLanguage(Lang);
 		Env.verifyLanguage( getCtx(), m_language );
 
@@ -274,7 +270,7 @@ public class CompiereService {
 		if (log.isLoggable(Level.INFO)) log.info(" #Date = "+ Env.getContextAsDate( getCtx(), "#Date"));
 
 		Env.setContext( getCtx(), "#M_Warehouse_ID", M_Warehouse_ID );
-		Env.setContext(m_ctx, Env.LANGUAGE, m_language.getAD_Language());
+		Env.setContext(getCtx(), Env.LANGUAGE, m_language.getAD_Language());
 		
 		// Create session
 		MSession session = MSession.get (getCtx(), false);