I'm trying to upload a new custom header (header3) into the Prologue theme, having successfully uploaded one previously to this attempt (header2).
The header3 image is cropped to the required dimensions (726x150) and the WordPress custom header image function confirms the upload of the new header. However, unfortunately the new header3 image doesn't appear in the blog.
I've tried reverting to the original header, then trying to upload the new header3. This however doesn't upload header3 that I'm trying to implement, but uploads header2 (which should now be completely removed having selected the 'Reset header image and colour' function).
I've tried removing cookies and clearing cache just in case, but that also hasn't worked.