Hello, and thank you very much for your support.
After an actualization, I have this problem (running OSx 10.6 Snow leopard).

ava.lang.IllegalAccessError: tried to access class javax.swing.plaf.synth.SynthTableUI from class jd.gui.swing.jdgui.BasicJDTable
at jd.gui.swing.jdgui.BasicJDTable.<init>(BasicJDTable.java:65)
at org.jdownloader.gui.views.components.packagetable.PackageControllerTable.<init>(PackageControllerTab le.java:135)
at org.jdownloader.gui.views.downloads.table.DownloadsTable.<init>(DownloadsTable.java:79)
at org.jdownloader.gui.views.downloads.DownloadsPanel.<init>(DownloadsPanel.java:117)
at org.jdownloader.gui.views.downloads.DownloadsView.<init>(DownloadsView.java:16)
at jd.gui.swing.jdgui.JDGui.initComponents(JDGui.java:525)
at jd.gui.swing.jdgui.JDGui.<init>(JDGui.java:238)
at jd.gui.swing.jdgui.JDGui.<init>(JDGui.java:145)
at jd.gui.swing.jdgui.JDGui$34.edtRun(JDGui.java:1810)
at jd.gui.swing.jdgui.JDGui$34.edtRun(JDGui.java:1806)
at org.appwork.utils.swing.EDTHelper.run(EDTHelper.java:95)
at org.appwork.utils.swing.EDTHelper.start(EDTHelper.java:130)
at org.appwork.utils.swing.EDTHelper.waitForEDT(EDTHelper.java:144)
at org.appwork.utils.swing.EDTHelper.getReturnValue(EDTHelper.java:76)
at jd.gui.swing.jdgui.JDGui.init(JDGui.java:1806)
at jd.SecondLevelLaunch$12.edtRun(SecondLevelLaunch.java:998)
at jd.SecondLevelLaunch$12.edtRun(SecondLevelLaunch.java:990)
at org.appwork.utils.swing.EDTHelper.run(EDTHelper.java:95)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:715)
at java.awt.EventQueue.access$400(EventQueue.java:82)
at java.awt.EventQueue$2.run(EventQueue.java:676)
at java.awt.EventQueue$2.run(EventQueue.java:674)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:86)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:685)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:196)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:188)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)



Reinstall and other maneuvers not working.
Thank you for your help