<t>I had the same problem after the version 1.4 (the first as I used), with 1.6 and 1.8 in the default directory. Same problem when I install the new version after I had uninstalled the previous version. Only the versions .jar was working. <br/>
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I has just to install the versions 1.5, 1.6, 1 ...

<r>With the following JNLP file "<URL url="http://www.sweethome3d.eu/SweetHome3D-512MB.jnlp"><s>[url=http://www.sweethome3d.eu/SweetHome3D-512MB.jnlp]</s>http://www.sweethome3d.eu/SweetHome3D-512MB.jnlp<e>[/url]</e></URL>" the SweetHome3D window is displayed some seconds and then is closed... <br ...

<t>javaw -Xmx512m -jar "C:\Program Files\Sweet Home 3D\SweetHome3D-2.0.jar" <br/>
It is well. <br/>
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javaw -Xmx1024m -jar "C:\Program Files\Sweet Home 3D\SweetHome3D-2.0.jar" <br/>
SweetHome3D window is displayed some seconds and then is closed, as for SweetHome3D-2.0.exe and SweetHome3D-2.0 ...

<t>When I start "SweetHome3D.exe". The SweetHome3D window is displayed some seconds and then is closed. Same problem with "SweetHome3D.jnlp". <br/>
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But, strangely for me, if I use SweetHome3D-2.0.jar, the software is entirely usable ! <br/>
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First lines of Error files "hs_err ...