I want to use "featured images" in my blog (Theme Twenty Ten).
The pictures are .png, the size ist 940x198.
Right after the first implementation in a page, it looked fine. The day after, it looked like now - distorted.
The two pages are:
At first, the pictures looked only bad in the pages, in the mediathek they looked OK. But then it became unpredictible. I edit a corrupt image and it looked fine in the editor, but after saving it was bad, or I edited a good one and then it was wrong in the editor. I left with one picture OK, the other bad, the day after both looked bad. I gave it up and waited for an answer on a similar question in the forum. Unfortunately, the staff's answer was meaningless ("try an other browser").
Today I did a new upload, this time the picture was immediately corrupt:
The picture should look like this screenshot:
This happens in Firefox21, Firefox 22 and IE8.
Thanks for any advice.
The blog I need help with is barmhertz.wordpress.com.