Dear Ulrike, > So it looks as if the problem is new. <</Type/Page/Parent 4 0 R/Resources 6 0 R/MediaBox[0 0 283 283]/Group<</S/Transparency/CS/DeviceRGB/I true>>/Contents 2 0 R>> Maybe it is not a problem but a warning for inclusion of more than one figures with 'page group' related to transparency in a single page. Thanks, Akira