Using the WordPress Appearances/Header page, I uploaded a new header image. It appears to upload fine and even shows it perfectly displayed on the "Crop" page:
Ok so far.
I click the "Crop and Publish" button and the image then appears with a black background or weird negative image:
If I go to the site the weird image also appears:
I have tried the following plugins with no relief:
HITS- IE6 PNGFix
Please help, this is the first time I have seen this happen in many many years of using WordPress.