It's still acting wonky for me, if I choose yellow as my accent color, it shows up as purple. Also the option to change the background color of the tiles vanished. My saved color schemes from before are there but I have no way of changing background tile color or text color anymore. If I choose a color scheme that I have previously created, eg one with a black tile background, the background tile colors are still stock like a rainbow. Jeese!
Ahh I see the issue.
The option to change the background colour of tiles and of text is no longer provided on Windows 8.1. This is because Microsoft decided that non modern UI tiles should be coloured based on the icon they have rather than a single stock colour. The text colour has to remain white because the OS has a limitation in how it handles the text colours and so anything other than white is liable to cause problems.
Likewise the option for altering the number of rows was removed as Microsoft removed support for this from Windows 8.1.
Regarding the bright colours, it seems there is also an OS issue with colours which have a large green component (reproduced without Decor8). We will modify Decor8 to internally block colours that trigger this in the next update by bringing down the channel below the trigger point. I don't think we were aware of that issue, so thanks for letting us know as in general use with automatic colour schemes it was unlikely to show up. I suspect it is an overflow issue in the colour handling in the OS.
Microsoft removing the control over the standard tile background colour is frustrating for us too and should we find a solution to this we will of course update the software to include it.