Talk to them - most developers aren't remiss in telling you what's wrong. I'd almost go further and say if you don't know without asking you've got an issue. I

Talk to them - most developers aren't remiss in telling you what's wrong. I'd almost go further and say if you don't know without asking you've got an issue. I can tell you how happy or otherwise 75% of the people working for me are and hazard a decent guess at the other 25%.