Thanks Rudi, I'm not sure how to do your workaround, I can't see anything in the ultravnc_settings util to create a new ini file. Do you mean start winvnc as an application on all PCs?
Can I just copy the ini file from a PC I know is set correctly?
Just to confirm, do I need to be logged in as local admin or domain admin for the setting to be saved? I would prefer to find a way to make sure the password is saved when I first install it.