You just unearthed important information because my HP AIO (G85 - basically a HP990 printer) has exactly the same problem -- even when using the CUPS system instead of the poorly conceived HP driver -- hence the problem must be a generic Panther issue and not a particular driver issue. - Kent You wrote: I just discovered that the Canon Duplex Printing unit works just fine in Jaguar. It prints the first page top to bottom and the reverse page bottom to top the way it should. But in Panther - forget it! So there is a serious problem with the way printing is set up in Panther. Either that or there is a serious problem in the way the latest Canon drivers interact with Panther. jg