We were printing in standard mode, not enhanced. Why
should it make a difference?. Is this type of problem
endemic to Tek printers? or is it powerpoint coming to
terms with postscript?
It's PowerPoint, not PS or the printers. The PostScript that comes out of
PowerPoint when you invoke certain features (transparency, gradients in
particular) could best be described as "stupidity applied with brute force"
;-)
Particularly, where smarter PS would query the printer it's running on to
get the current resolution and adjust what it does accordingly (hey, it's a
programming language, it can DO this stuff ... that's what makes it so
useful) PPT's PS simply assumes a set resolution and forges onward.
Problem is, if the printer and assumed resolutions don't match (as they
might not in enhanced mode) then things get ugly, and one of the results is
horizonatal white lines through gradients and transparencies.
I'd try changing the driver settings on the Tek to see if changes in
resolution and other such features can't solve the problem.