folder.jpg not always displayed in File Mode

[toccata10]

I encountered this pb in Transparency and in Back Row skins.
In Transparency, I use the "side view" setting. When I'm in File Mode, sometimes the folder.jpg display correctly, sometimes they don't and are replaced by a generic picture.

Correct display:

After some browsing, I get this incorrect display: some icons are replaced by a solid blue folder:

This can happen on subfolders too:

Same issue with Back Row:

The Library Mode displays correctly the items.
My test computers: win7 x64, gotham 13.1 and openelec 4.0 on an ion box. Same issues.
I've uploaded here a structure with a few folder.jpg and fanart.jpg:
https://www.dropbox.com/s/k0lh1isps5npbr9/Openelec-test-bug.zip
so that you can reproduce the bug.

[ulion]

XBMC uses github for development only, i.e. for pull requests and the discussion of code.

So we use a hook script to automatically close this new issue here.

If you can, we encourage you to investigate the issue yourself and create a Pull Request for us to review.
You may want to check the contributing guide: https://github.com/xbmc/xbmc/blob/master/CONTRIBUTING.md

For bug reports, feature requests and all other support, please go to http://forum.xbmc.org.

Thanks,
Team XBMC.