Mozilla 1.2.1 + RedHat 9.0 -- "pop-up" text entry window problem.

[Alan McKenney]

I'm running the version of Mozilla that comes with RedHat 9.0
(1.2.1), and I'm having a problem with any window that is
"popped up" that requires text entry: it won't accept typed text.

Typical windows that have this problem:

-- Login windows
-- Preferences windows
-- Setup windows.

I can cut-and-paste data, either using the middle mouse button
(Xterm style) or using right-click (MS windoze style), I can
push and unpush buttons.

But typing keys has no effect.

Normal -- HTML -- windows are no problem. (That's what I'm using
now.)

I am using TWM as my window manager, and have
click-to-focus turned off -- that is, a window gets focus
when the mouse pointer is in it.

Any suggestions (other than using a different OS)?
This problem makes Mozilla unusable, since I can't
even configure it.

Any further information you need?

-- Alan McKenney