nothing saving

Noob needs to know about saving. Have saved before only to lose it all inexplicably. Now nothing is saving even with Enter key. Luckily Save as Default in U-P will keep my current and only work as the Default Scene. Ideas?

Are you trying to save in C: ? temp?
if you try and save somewhere that is write protected or managed by a firewall, it might say “No”
Try saving in your documents directory,
unless you are on linux and then I have no idea

Not on Linux, it’s newly upgraded 2.65, doing exactly what the older 2.55 did. No firewall, a Mac OSX 10.7.5. Blender’s own document folder. Thanks in advance K