I am an idiot. I didn't use Calendar functionality of the J-Pilot on my
SGI O2 for years. This view was somewhat damaged - the buttons covered
the calendar widget itself and other fields weer also displaced. I
thought that it's a bug of the long-abandoned IRIX port of this
(otherwise excellent) software.
Not at all.
With of calendar part of the screen can be adjusted by mouse - there is
a control for that. It was simply incorrectly set (by me, of course). I
just moved it and now the things are usable once more.