My printer is asking me to send them a pdf x1a file. I installed both the ng (1.5.3) and the trunk (1.5.4) versions in the hope that I would be able to do this, but I cannot get either of them to show me an option within the "export as pdf" dialogue. Under: File Options> Compatibility: I see only these three possibilities: 1.3, 1.4, and 1.5. Upon mouse-over I get the hint that there might be other ones (pdf x1a, x3, x4), but these do not appear as options in the drop-down menu. Would changing all the images one by one to CMYK make this option available?