pspg: Problems with certain commands

If used with \?, the screen is blank (except for the Quit 0…4 C.Freeze) at the bottom. If I press PageDown it’s still blank, but when I press it again, I get to see the last 2/3 or 3/4 of the output. I also get a mostly blank screen when using \d on some tables with many columns and constraints/triggers (for example, it only shows the first line of a textsearch trigger, but it does show a blank inverse video, cursor line, that can be moved with the arrow keys).