I've been using photofiltre for a few days now and I'm starting to feel its one of the greatest freeware photo and picture editor apps for now compared to its simplicity. Really good work guys. This is now my number one.
Yet I still have to use ******** or ************ (no competitors here!

The bug is when I use saturation slider. It affects all colors' saturation no matter if I choose only one channel.
For instance: I want to lower yellow channel's saturation -> I choose yellow channel -> I turn the saturation slider down -> I see that all channels saturation is lowering, the image is going towards greyscale!
The same goes if I want to add some punch for one color via the saturation slider -> all the colors in the image are affected, not that particular one channel I chose.
Tested with several jpegs with different colors.