Dear all,

I think the thread was mentioned several times (at least partly) in the forum, but I think the problem was not really solved. 
In the group analysis settings (using the conn toolbox) I can run a contrast and display the results without problems, however, after 2-3 contrasts I'm not able to click on another contrast in the results 2nd level window anymore and receive the following error message in the matlab command line.

Exception in thread "AWT-EventQueue-0": java.lang.NullPointerException at com.jgoodies.looks.plastic.PlasticComboBoxButton.paintComponent(PlasticComboBoxButton.java:206)
    at javax.swing.JComponent.paint(JComponent.java:1056)
    at javax.swing.JComponent.paintChildren(JComponent.java:889)
    at javax.swing.JComponent.paint(JComponent.java:1065)
    at javax.swing.JComponent.paintToOffscreen(JComponent.java:5210)
    at javax.swing.BufferStrategyPaintManager.paint(BufferStrategyPaintManager.java:290)
    at javax.swing.RepaintManager.paint(RepaintManager.java:1272)
    at javax.swing.JComponent._paintImmediately(JComponent.java:5158)
    at javax.swing.JComponent.paintImmediately(JComponent.java:4969)
    at javax.swing.RepaintManager$4.run(RepaintManager.java:831)
... an more

In this case I must click on the x in the conn window and I answer yes to the question save and exit. Then I have to restart conn and the error will appear again after 2-3 contrasts.
This is really annoying, in particular with bigger datasets that need some time to reload the data.
I work with matlab_22b and conn22.a using linux and vnc viewer for visualizing (the data is located on a server). The error appeared also with older matlab versions (2018b).
version -java 
'Java 1.8.0_202-b08 with Oracle Corporation Java HotSpot(TM) 64-Bit Server VM mixed mode'.

The problem seems to be specific for linux, with windows I have never problems like that. 
Did someone solved this problem?

Ralf