I'm not sure if this is a new issue with 1.5.2, but I don't recall seeing it before. I'm probably missing something in the print dialog box, but when I want to use Epson's Advanced Black and White Printing Mode with my Pro 4800, I set the Colorsync profile to "System Managed" in the print dialog box, then use the Epson Advanced B&W settings in the >Printer Settings >Color Management dialog. What I'm getting for prints looks reasonable except for lots of posterization in the shadows. Again, I don't recall this being an issue before 1.5.2 and I don't think I'm doing anything differently.
One more bit of data: When I export the same image as a 16 bit TIFF and print in Photoshop using the same settings, I get a beautiful print with no posterization.
Is the "system managed" selection in Aperture's print dialog the same as the "no color management" selection in PS? Epson's Technical support says to use the latter, but they don't mention Aperture at all.
MBP Mac OS X (10.4.8)