Perhaps the phal is growing roots under the bark that aren't obviously visible? Growing a new leaf though is a positive sign; it means its trying to thrive. The color should not be a problem. Probably a sign of the color the phal has on its blooms (like purple or red flowers). No stem/spike is ok; the phalaenopsis will probably grow roots and leaves before blooming because it will need more roots to thrive.
As for the den, I myself do not have any dens currently, but sounds like it is not dying. I know its disappointing to lose blooms, but as long as the leaves or plant are not yellowing, the blooms can drop without the plant dying. Possibly bud blast, or simply unhealthy coming from a grocery store (hate to be cynical, but it happens). Sounds like you're headed in the right direction. Good luck!
