For those of us with Falcons and using (trying) dBMAN - I have a
following workaround which may of use to you (all).

Implement the 'fix' using dBMAN's own commands. Specifically the
following commands (apply them anywhere within a filename.cmd of your
choice):

set erase video to 1
set say video to 1
set get video to 4

These set color values for three video modes (?). What you should
wind up with, for these numbers, is red text on a white background
and the indicator/selector/cursor line is a pleasant blue. I use this
setup exclusively from now on in 16 or 256 color hi-res.

You can read the full screen with no difficulty. Play with the
numbers if you wish to set up different colors (don't know how many
selections that are workable, up to you to find out).

In addittion, if you save these (or more commands) in a file
specifically named AUTO.CMD (I think) - then dBMAN will automatically
load and run that CMD file every time you start dBMAN (make sure that
file is in the same directory as dBMAN, of course).

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Another tidbit, don't use the PIXEL GRABBER Accessory at the
same time you intend to use dBMAN - dBMAN will not load.