OK, i found out that this is a Nvidia issue with their current driver revision...

<r>Hi guys,<br/>
<br/>
im unable to start Sweethome 3D with Xinerama enabled.<br/>
Im running a Xinerama setup bound with 2 Nvidia Gfx and 4 Screens connected. (Geforce GT520 & GTX560ti)<br/>
<br/>
<br/>
Whenever i try to start Sweethome3d, this happens:<br/>

<LIST><s>[list]</s><LI>maddeepee ...