I am on an iMac and I experience this problem.
When I upload my channel art and check it out it looks like this
The darker sides should be equal but now that's the weird part, this seems to be a problem only to my iMac as when I go to my channel from another computers I can see the channel art being just fine.
When I upload my channel art and check it out it looks like this
![Screen Shot 2014-06-14 at 11.16.28 AM.png Screen Shot 2014-06-14 at 11.16.28 AM.png](https://yttalk.com/data/attachments/19/19964-ed7f88b5916d578c911b9b6c47bf9aef.jpg)
The darker sides should be equal but now that's the weird part, this seems to be a problem only to my iMac as when I go to my channel from another computers I can see the channel art being just fine.