[0] I couldn't look up 'color problems' for obvious reasons.
1. They raised exorbitant amount of money which set quite high expectations from them.
2. The app didn't take off as expected (at least the vocal early adopters hate it).
3. Peter Pham (the designer co-founder) and chief scientist, DJ Patil quit or got fired, which raised eyebrows.
[0] I couldn't look up 'color problems' for obvious reasons.