Have you tried to use ImageMagick for simple thumb creation instead of using the plugin and does this work? If not, I guess there might be a problem with the ImageMagick setup, see this thread How to switch from GD to ImageMagic as image engine?
Have you tried to use ImageMagick for simple thumb creation instead of using the plugin and does this work? If not, I guess there might be a problem with the ImageMagick setup, see this thread How to switch from GD to ImageMagic as image engine?