NullPointerException while trying to export or filter ALV

Hi.

I have an error while trying to export an ALV via this button:

Other icons like sorting work well. Problem seems to be with icons that generate context menus, because the filter icon as well doesn't work.

You can see the context menu for just a second, then it disapperas and you are not able to click on it.

At the same time a java excetption stacktrace shows up:

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
        at com.sap.platin.base.control.grid.Grid.getLogicCellRect(Grid.java:1970)
        at com.sap.platin.base.control.grid.Grid.getCellRect(Grid.java:1958)
        at com.sap.components.controls.advancedGrid.SapGrid$DNDGrid$DNDTableView.getFocusInScreenBounds(SapGrid.java:14316)
        at com.sap.plaf.synth.NovaFocusPaintManager.setFocusPainterBounds(NovaFocusPaintManager.java:638)
        at com.sap.plaf.synth.NovaFocusPaintManager.setNewFocusedComponentImpl(NovaFocusPaintManager.java:400)
        at com.sap.plaf.synth.NovaFocusPaintManager.access$200(NovaFocusPaintManager.java:51)
        at com.sap.plaf.synth.NovaFocusPaintManager$DelayedFocusPaintRunnable.run(NovaFocusPaintManager.java:344)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
        at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)
        at java.awt.EventQueue.access$500(EventQueue.java:97)
        at java.awt.EventQueue$3.run(EventQueue.java:709)
        at java.awt.EventQueue$3.run(EventQueue.java:703)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)
        at com.sap.platin.micro.event.GuiEventQueue.dispatchEvent(GuiEventQueue.java:79)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

In other transactions the error does not show up when using the same functionality?

Can someone give me a hint where to have a closer look i.o. to solve this?

I'm working with SAPGUI7.40 rev4 on a Ubuntu 12.04.4 LTS linux.

Thanks in advance. :-)

Daniel