Hi been a while since i last looked in these forums.
I found a solution to the save problem in 1.4 and vista/win7.
Start GtkRadiant then goto edit > preferences. In the ‘Layout’ section, untick ‘Use win32 file load dialogue’. You should now be able to save, save as and save selected as normal. Be sure however to add the .map extension when saving.
This may nor work for everyone, but it has for me. Good luck 
