errorreport: try to add a column

Hi group,

I hope I give you all the information needed to fix this.
I am not really a guru, so if you miss anything, just let me know.

System: Debian Sarge
Postgres installed with apt-get. Version 7.4.7
I installed PGADMIN3 also via apt-get from:
deb
ftp://ftp.nl.postgresql.org/pub/mirror/postgresql/pgadmin3/release/debian
sarge pgadmin

The install went painless (as usual with apt-get. :-)

I did the following WITHOUT PGADMIN3:
created a table called tbltest from psql commandline:
create table tbltest(
testid SERIAL PRIMARY KEY,
naam text);

Then I started PGADMIN3 and connected as dbowner (erwin).
All OK so far.
I could browse the tables, etc. No errors.

When I tried to add a new column (a column named 'geboortedatum' of type
date), I got the following warning.
Actually I receive such a warning for every column I try to add.

---------------------------------------------------------------

src/common/string.cpp(2406): assert "wxAssertFailure" failed: bad index in
wxArrayString::Remove

Call stack:
[05] wxStackWalker::Walk(unsigned)
[06] 0x4078cea8
[07] wxAppConsole::OnAssert(wchar_t const*, int, wchar_t const*, wchar_t
const*)
[08] wxApp::OnAssert(wchar_t const*, int, wchar_t const*, wchar_t const*)
[09] wxOnAssert(wchar_t const*, int, wchar_t const*, wchar_t const*)
[10] wxAssert(int, wchar_t const*, int, wchar_t const*, wchar_t const*)
[11] wxArrayString::RemoveAt(unsigned, unsigned)
[12] 0x0819dc16
[13] 0x081a1556
[14] 0x081a27f3
[15] wxAppConsole::HandleEvent(wxEvtHandler*, void
(wxEvtHandler::*)(wxEvent&), wxEvent&) const
[16] wxEvtHandler::ProcessEventIfMatches(wxEventTableEntryBase const&,
wxEvtHandler*, wxEvent&)
[17] wxEventHashTable::HandleEvent(wxEvent&, wxEvtHandler*)
[18] wxEvtHandler::ProcessEvent(wxEvent&)
[19] wxWindowBase::TryParent(wxEvent&)
[20] wxEvtHandler::ProcessEvent(wxEvent&)
[21] wxWindowBase::TryParent(wxEvent&)
[22] wxEvtHandler::ProcessEvent(wxEvent&)
[23] wxWindowBase::TryParent(wxEvent&)
[24] wxEvtHandler::ProcessEvent(wxEvent&)
[25] 0x404e4573
Do you want to stop the program?
You can also choose [Cancel] to suppress further warnings.

---------------------------------------------------------------


I answered 'NO' and all was fine from there on. The new column was created
just fine.

What is wrong?
Should I give you more information?

Thanks for your time!

Regards,
Erwin Moller