Unable to drag and drop out of aperture

Hi,

As of a few days ago i've had a slight problem with my aperture libary.

I can no longer drag and drop images out of aperture onto the desktop or other apps etc.

I have not changed anything it was working fine until just recently - I haven't modified or done anything to change the behaviour.

Aperture settings has previews enabled.

I have attempted to regenerate previews by selecting images and clicking regenerate

I have rebuilt permissions

I have rebuilt the entire library

I have re-installed aperture

I have manually deleted previews and thumbnails from within the aperture library to force a rebuilt.

Nothing works.

I cannot drag out files

with the exeption I can drag and drop files which have had edits done to it - so the original master has been edited and it's created a modified version.

As I said - previews are enabled and I can also right click and export version or master without issues for any files.

I have latest versions of aperture 3.