I asked Quark about a similar problem with my Phaser 8550. They sent me a replacement PPD and it works fine.
PowerMac G5, 2.7DP, 8Gb RAM; OSX 10.4.11 and 10.5.8 (on separate drives). (Also a PowerMac 7300 that's still running Quark 4.1 on OS 8.6 ...)