DIsappearing window picture and folder content ?

Question

Hi,
From time to time, I notice that some of my windows background picture is converted to a black coloured backgroun (in icon mode) and some of my folders (less than 50 files in total) in all view mode, become empty: viewing them using a3rd party sometimes reveal the files, or by disk utility as well.
SOmetimes I restart and everything is back.
I have just repaired permission using the OS X CD, shut down for good measure etc...
Anybody with similar experience?
I have 2 x attached firewire drives and lots of memory.
Any idea?
Thx,
JP.

Answer 1

I understand that I didn't set the tags to display my code properly - I'm sorry, I didn't know about it... But I don't quite understand what else I've done wrong. Let me rephrase my question:
I'm trying to print a maze on screen using a JFrame object. Unfortunately, when I run the program (and quit it properly after each time), one of the following happens:
a) The maze is printed correctly.
b) The maze appears for less than a second, then disappears leaving a blank JFrame window.
c) The JFrame window remains blank (which may be the same thing as b, only the maze flashes by too fast for me to notice).
I've gone through a few JFrame tutorials, and I think I've followed the general guidelines. I tried looking for help at other sources - to see if anyone else had trouble with their Jframe content being displayed only sometimes. I even tried setting the Jframe object to always appear on top, but it didn't help. Since I've little experience with coding in Java, I was wondering if someone could please help me by telling me if I'm doing something wrong?
Here's my code:
public class Test extends JFrame
  public static void main(String argv[])
    JFrame test = new JFrame("nuts");
    test.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    test.setSize(700, 700);
    Container content = test.getContentPane();
    test.setVisible(true);
    test.setAlwaysOnTop(true);
    // create object called 'maze' here
    maze.paint(content.getGraphics());
}I don't mean to be rude or anything; nor do I rightly understand what I've done wrong. I'm not trying to leech off anyone; I've honestly tried to figure this out, and I can't. So I'm really hoping someone can please help me. Thank you!