System error when starting LoginForm widget from iPhome home screen

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The LoginForm widget is working fine in the Safari browser of an iPhone. However problems arise when the user creates a bookmark of the Mendix app on the home screen. When starting the app from the home screen the standard Mendix logon page is shown instead of the LoginForm widget. Logging in is impossible. Does anybody know how to solve this issue? In the Mendix log we see the following error when the user starts the app from the home screen. 2014-07-09 08:17:27.748 ERROR - Connector: java.lang.IllegalArgumentException: Invalid UUID string: undefined at java.util.UUID.fromString(Unknown Source) at com.mendix.externalinterface.connector.RequestHandler.getSessionFromRequest(SourceFile:86) at com.mendix.externalinterface.connector.RequestHandler.getSessionFromRequest(SourceFile:70) at com.mendix.pa.a(SourceFile:176) at com.mendix.pa.processRequest(SourceFile:102) at com.mendix.externalinterface.connector.MxRuntimeConnector.processRequest(SourceFile:74) at com.mendix.core.impl.MxRuntimeImpl.processRequest(SourceFile:748) at com.mendix.m2ee.appcontainer.server.handler.RuntimeHandler.handle(RuntimeHandler.java:45) at org.eclipse.jetty.server.handler.HandlerList.handle(HandlerList.java:52) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116) at org.eclipse.jetty.server.Server.handle(Server.java:368) at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:489) at org.eclipse.jetty.server.BlockingHttpConnection.handleRequest(BlockingHttpConnection.java:53) at org.eclipse.jetty.server.AbstractHttpConnection.content(AbstractHttpConnection.java:953) at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.content(AbstractHttpConnection.java:1014) at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:861) at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:240) at org.eclipse.jetty.server.BlockingHttpConnection.handle(BlockingHttpConnection.java:72) at org.eclipse.jetty.server.nio.BlockingChannelConnector$BlockingChannelEndPoint.run(BlockingChannelConnector.java:298) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608) at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543) at java.lang.Thread.run(Unknown Source) Now the standard Mendix logon page appears. When the users enters their correct credentials the same error is generated in the log. The user receives a message that the login is incorrect.
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