I have created a new blog today just to help my friend with this.
I've searched the forum for some time and seen many people having problems with their header, however, I am unable to find a solution.
The image is 940x198 @ 72 px/inch as prescribed. When I upload it, the resolution (like a jpeg with the lowest quality compression) drops dramatically.
I have tried to change the format from jpeg to PNG without result.
I have not added any plugins, an mentioned earlier, I created a brand new blog in order to solve this, so it cannot be anything that i've done.
Thanks in advance!