enkonyito, did you export and load all the YafaRay DLLs required for the plug-in, like in the [font=courier new]loadDLLs[/font] method I programmed in [font=courier new]YafarayRenderer[/font] class?

jjocsak, the current version of the plug-in can work only in 64 bit. Maybe you installed Sweet Home 3D in 32 bit? If it's the case, just relaunch the installer and select the 64 bit architecture in the screen that allows to choose the installation folder. Of course, this will be possible only if your system is 64 bit.

MichaelN, did you try with some other files, or maybe the demos?