Why are the Play, Previous, and Forward icons in iTunes unresponsive?

I have all the updates. Everything works if I use the keyboard controls, but when I try to mouse over and click, it isn't responding everytime.
Here is a video to explain what I mean:
https://www.youtube.com/watch?v=f8y23C4SuUM

If you do not see an item on a toolbar and in the toolbar palette then click the "Restore Default Set" button to restore the default toolbar set up.
If the above steps didn't help then see:
* http://kb.mozillazine.org/Corrupt_localstore.rdf

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Hi there,
I got the program below. I am wondering why are the threads start and terminate randomly? Everytime, I run the program, it produces different results.
I know that these four threads have got same normal priority (should be 5), and under windows there is something called timeslice. Then these four threads rotate using this timeslice. How do we know what exactly the timeslice is in seconds? If the timeslice is fix, then why the results are ramdom?
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* To change this template, choose Tools | Templates
* and open the template in the editor.
package mythreadone;
* @author Administrator
public class MyThreadOne implements Runnable {
String tName;
Thread t;
MyThreadOne(String threadName) {
tName = threadName;
t = new Thread(this, tName);
t.start();
public void run() {
try {
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public static void main(String args[]) {
// Why are the threads start and terminate randomly?
new MyThreadOne("1");
new MyThreadOne("2");
new MyThreadOne("3");
new MyThreadOne("4");
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System.out.println(
"Terminating thread: main thread.");
1. Firstly, I set in the main function:
Thread.sleep(10000);
and I run the program it gives:
Thread: 1
Thread: 4
Thread: 2
Thread: 3
Terminating thread: 1
Terminating thread: 3
Terminating thread: 4
Terminating thread: 2
Terminating thread: main thread.
BUILD SUCCESSFUL (total time: 10 seconds)
Run it again, it gives:
Thread: 2
Thread: 4
Thread: 3
Thread: 1
Terminating thread: 2
Terminating thread: 1
Terminating thread: 3
Terminating thread: 4
Terminating thread: main thread.
BUILD SUCCESSFUL (total time: 10 seconds)
And my question was why it outputs like this? It suppose to be:
Thread: 1
Thread: 2
Thread: 3
Thread: 4
Terminating thread: 1
Terminating thread: 2
Terminating thread: 3
Terminating thread: 4
Terminating thread: main thread.
BUILD SUCCESSFUL (total time: 10 seconds)
Why these four threads start and finish randomly each time I run the program? I use Windows, suppose there is a timeslice (i.e. 1 second), these threads have the same priority. Then the threads should start and finish in turn one by one. Am I right?
2. My second question is:
When I change the codes in the 'main' function into:
Thread.sleep(10000); -> Thread.sleep(2000);
it gives me the results like:
Thread: 1
Thread: 4
Thread: 3
Thread: 2
Terminating thread: main thread.
Terminating thread: 1
Terminating thread: 4
Terminating thread: 3
Terminating thread: 2
BUILD SUCCESSFUL (total time: 2 seconds)
Run it again:
Thread: 1
Thread: 2
Thread: 3
Thread: 4
Terminating thread: 3
Terminating thread: main thread.
Terminating thread: 4
Terminating thread: 2
Terminating thread: 1
BUILD SUCCESSFUL (total time: 2 seconds)
I tried several times. The main thread always terminates before or after the first child thread finished.
My question is why it doesn't output something like:
Thread: 1
Thread: 2
Thread: 3
Thread: 4
Terminating thread: 3
Terminating thread: 4
Terminating thread: 2
Terminating thread: main thread.
Terminating thread: 1
BUILD SUCCESSFUL (total time: 2 seconds)
or
Thread: 1
Thread: 2
Thread: 3
Thread: 4
Terminating thread: 3
Terminating thread: 4
Terminating thread: 2
Terminating thread: 1
Terminating thread: main thread.
BUILD SUCCESSFUL (total time: 2 seconds)

user13476736 wrote:
Yes, my machine has multi-core. Then you mean that if I got a one core machine the result should always be:
Thread: 1
Thread: 2
Thread: 3
Thread: 4
Terminating thread: 1
Terminating thread: 2
Terminating thread: 3
Terminating thread: 4
Terminating thread: main thread.
BUILD SUCCESSFUL (total time: 10 seconds)
???No.
>
How to explain my second quesiton then? Why the main thread always terminates before some of the child threads end? Thanks a lot.

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