Twentyten theme images not uploading after moving site

Hi all,

I moved a site from a /wp directory into the main directory and now when I try and upload a new header it doesn’t upload. Same for the background. Also the images are showing in the Gallery but with no thumbnails. The previously uploaded images are fine.

I did all the usual things, I went through the entire site, updated all the links to media, turned off all the plugins, but no difference. The header just won’t upload. It just gives a blank screen. I know I can save my header with the name of one of the default header pictures and upload it that way but I need to get the normal uploading method sorted out. The problem all started when I moved the WordPress installation to a different directory. Maybe there is something I have missed…

Any thoughts?