I had the same problem for 2 month - it was that time the directory protection.
Now, i switched to a new managed server (to a new domain) without directory protection and i have this problem again. I'm already working two days on this, but i can't find the problem. If i use now the 522x120px with retina then it does not resize (simple it´s to big).
What i did:
1. turn off retina - save
2. permalink update - save
3. logo upload - save
4. retina on - save
5. flying news theme installation again
6. database check - ok
7. search and replace again - no finds
8. ht.acces check - ok
9. No solution - now it works with the 261x60px. version - but it´s no option.
Please take a look on my website. To give u the full access of my ftp and wp user datas is always a problem. If you need access to a special file it´s no problem. Please let me know what we can do it....
All following comments are shown for registered users only!