Flickr: Some pictures are shown black unless being zoomed in completely

Reproduction Steps:
1. launch qmlviewer then execute flickr.qml file
2. wait network to download pictures
3. select a picture to transfer to information pannel
4. click [View...] button to see the full-sized picture

Expected Result:
If the picture is available, the picture is shown correctly

Actual Result:
the picture is black, but press&drag the slider to the right-most position to make the picture is zoomed in completely,the picture is shown.

Note:
1).This issue just happen on some pictures
2).Even the picture can be shown after being zoomed in, but some pictures cannot be shown completely.