[yt-users] Issue with volume rendering saving to other figure format

Hi all, I seem to have trouble saving scenes from volume rendering to other image formats (pdf, eps etc.). For example if I type sc.save('test.pdf') it still gives me a file called 'test.pdf.png'. While for slice plots and projection plots works fine (so I guess I have the right backends). I am using the most updated 3.4-dev version. Thanks for help!