openpublish image upload

I'm currently unable to upload pictures to my openpublish install and need some help....

I'd uploaded OpenPublish and got everything configured, then I hit a number of problems.

I ran cron, added the google analytics module and ran update.php. I also deleted an article which had a thumbnail and main image attached.

These may not be the issues, but they began after this point.

Basically whenever I try to upload an image the files are greyed out and cannot be selected, trying to browse to images within the appropriate folder doesn't work either - even though they are there.