Thank you for your input and suggesstions. I am not sure how to duplicate this error. But it seems that you have to set the correct output type on first run, any modifications after that don’t seem to work. I have to delete the source and run it again.
However, I now seem to be getting the same problem in Windows however. Sometimes (not sure why), it works right away and paraview automatically sets Outline as the render type and I can find Volume view in the selection. But most times, I only get what you see in the screenshot.
Could, this be some kind of update issue ?, I mean it seems that the rendering is running before the source has loaded the data.
I mean there is no Volume/Slice views, for what should be a 3 dimensional vtk image (as in the example shown). If you were to apply a resampleToImage filter, the volume view would be enabled. I am wondering why, it sometimes works from the beginning and most times it only shows a surface.