Installation of Sweet Home 3D on a Mac

[Abbe]

I downloaded the Sweet Home 3D 2.2 Installer version.
To install it, I clicked on the .dmg file to expand it, then dragged the Sweet Home 3D 2.2 application folder to the desktop. When I clicked on the application in this folder, it bounces on the Dock for a very seconds, but does not open. However, when I click on the application in the folder on the .dmg file it does open and can be used.

I download Sweet Home again and the same thing happens.
My system meets the System Requirements for Sweet Home 3D.
I ran Mac Software Updates and my system files are all up-to-date.

What am I missing?
How can I run Sweet Home 3D 2.2 from the Desktop and not from the .dmg file?
Do I need to download other files to install and use this application?
What are they? Where are they?

Thank you for your help.
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Operating System: Mac OS 10.4.11

[Puybaret]

I never heard about such a problem.
Some information that will help me to fix this bug may appear in the console.
Could you try this, please?
1. Launch Console program found in /Applications/Utilities folder and click on "Clear display".
2. Launch Sweet Home 3D and import a piece of furniture.
3. When the bug happens, console program should display some new text.
Please select that text and copy paste it in a comment here.

Thank you for your help.

[Abbe]

Thank you for your prompt reply.

I followed your instructions in number one above:
Launched the Console program and clicked "Clear Display".

However I could not Launch Sweet Home 3D.
When I clicked on it, it bounced on the Dock for a few seconds but did not open.

Below is the message from the Console Log:

Mac OS X Version 10.4.11 (Build 8S165)
2010-02-11 15:47:20 -0800
2010-02-11 15:47:21.521 HPEventHandler[232]: DebugAssert: Third Party Client: ((__null) != m_lock && 0 == (*__error())) Can't create semaphore lock [/Volumes/Development/Projects/HP/MacRubens_Branch/mac-aio/core/HPEventHandler/Sources/HPTMNotificationManager.cpp:59]
2010-02-11 15:47:22.380 SystemUIServer[94] lang is:en
[LaunchRunner Error] The main class "com.eteks.sweethome3d.SweetHome3D" could not be found.
[JavaAppLauncher Error] CallStaticVoidMethod() threw an exception
Exception in thread "main" java.lang.NullPointerException
at apple.launcher.LaunchRunner.run(LaunchRunner.java:85)
at apple.launcher.LaunchRunner.callMain(LaunchRunner.java:50)
at apple.launcher.JavaApplicationLauncher.launch(JavaApplicationLauncher.java:52)

Thank you again for your help.