No matter what i do, setting background color to white using the patcher inspector, or using a [bgcolor 256 256 256], it always disappear. When i reopen Live and relaunch my device, it goes grey again...
As you can change Live's color theme, max for live device are designed to adapt themself to these themes.
To overdrive the colors I use a [pattr] object hoocked to a [swatch] to recall.
BTW, you can ask via the live APi wich colors are used