Index: /trunk/src/org/openstreetmap/josm/actions/downloadtasks/DownloadOsmTaskList.java =================================================================== --- /trunk/src/org/openstreetmap/josm/actions/downloadtasks/DownloadOsmTaskList.java (revision 4906) +++ /trunk/src/org/openstreetmap/josm/actions/downloadtasks/DownloadOsmTaskList.java (revision 4907) @@ -19,4 +19,5 @@ import javax.swing.JOptionPane; +import javax.swing.SwingUtilities; import org.openstreetmap.josm.Main; @@ -229,5 +230,5 @@ } if (!errors.isEmpty()) { - StringBuffer sb = new StringBuffer(); + final StringBuilder sb = new StringBuilder(); for (Object error : errors) { if (error instanceof String) { @@ -241,7 +242,13 @@ sb.append(""); - JOptionPane.showMessageDialog(Main.parent, "" - + tr("The following errors occurred during mass download: {0}", sb.toString()) + "", - tr("Errors during download"), JOptionPane.ERROR_MESSAGE); + SwingUtilities.invokeLater(new Runnable() { + @Override + public void run() { + JOptionPane.showMessageDialog(Main.parent, "" + + tr("The following errors occurred during mass download: {0}", sb.toString()) + "", + tr("Errors during download"), JOptionPane.ERROR_MESSAGE); + } + }); + return; } Index: /trunk/src/org/openstreetmap/josm/gui/PleaseWaitRunnable.java =================================================================== --- /trunk/src/org/openstreetmap/josm/gui/PleaseWaitRunnable.java (revision 4906) +++ /trunk/src/org/openstreetmap/josm/gui/PleaseWaitRunnable.java (revision 4907) @@ -99,5 +99,13 @@ ((PleaseWaitProgressMonitor)progressMonitor).close(); } - afterFinish(); + if (EventQueue.isDispatchThread()) { + afterFinish(); + } else { + EventQueue.invokeAndWait(new Runnable() { + public void run() { + afterFinish(); + } + }); + } } } catch (final Exception e) {