pgAdmin III v1.2 Beta-3: Problem with "alter Priveleges"

Hi,

I just discovered a problem with pgAdmin III v1.2 Beta-3:

If you try to change user/group privileges (right click on table, dialog
"Properties", Tab "Privileges") you get some strange results.

Eg. take a table with the privileges:

root a*r*w*d*R*x*t*
public arwd
user1 arwd

Now you want to remove "DELETE" from public:
Click on public, uncheck "DELETE", click on "Add/Change".
instead of removing the "d" from the Privileges column of the "public"
line, there is a new entry in the list with a blank User/Group name and
"awd" rights. Also the generated SQL is wrong, so clicking on OK results
in an Syntax Error from the Database backend.

I'm using the win32 version of pgAdmin III 1.2 beta3 against a
PostgreSQL 7.4.5 engine on an SuSE Linux 9.0.

Walter