[Leaplist] Printing challenge resolved!

[Bruce Metcalf]

Gang,

I believe I have discovered the problem. When I tell the printer that 
the media is [envelope], it assumes it's being loaded in portrait 
orientation, and rotates any input to print correctly.

Well, sorta correctly. I have to insert the envelopes upside down from 
the way the little picture on the feed tray shows, but that's close 
enough I can get my work done, which is what matters.

It appears this "auto-rotation" is an undocumented "feature" of the HP 
5550. Who knew?

My sincere thanks to all who responded, and that thanks is not lessened 
in the slightest by my tripping over the answer for myself.

Bruce