Bug: can't permanently set "Result copy quote character" on Windows

I want to set "Result copy quote character" single quote. I can set it 
for current session, but after application restart this setting resets 
to default " character.

OS: Windows Vista x64, Polish locale.
App version: 1.6.3 release, binary download and 1.7 snapshot 
pgadmin3-20070622.msi

After changing setting in Options dialog, setting is changed and saved 
into Registry Key
HKEY_CURRENT_USER\Software\pgAdmin III\Copy\QuoteChar
But after restart that value is not set form that key.

The program is able to set, and read from registry other properties, 
like for example <NULL> setting or "Result copy quoting".