Custom Logo, Corpo Theme

Attempt to upload logo image (in theme options, basic settings).
I select the image and click “Use This Image” and the window goes blank and stays blank (indefinitely). Only way out is to refresh the page which takes me back to “Theme Options” page with a blank “Custom Logo Image” field.

I have tried uploading the logo direct from my PC and I have tried selecting a logo already in the media library.

I’m on WP 3.8.1, theme, plugins etc. are all ‘latest’ version.

I am *not* using options framework plugin.

This problem has been around for a few weeks for me. Thought it might be a bug and get fixed, it still is a prob.