With the new process invokation methods Jasper Reports get started twice, fixed this issue

client/src/org/compiere/print/ReportCtl.java

@@ -226,14 +226,6 @@ public class ReportCtl
 			pi.setPrintPreview(!IsDirectPrint);
 			//	Execute Process
 			ProcessCtl worker = ProcessCtl.process(parent, WindowNo, pi, null);
-			if(worker == null) // Process has been canceled
-				return false;
-			
-			try {
-				worker.start();
-			} catch(java.lang.IllegalThreadStateException itse) {
-				// Do nothing
-			}
 		}
 		else
 		{