However, still can't authenticate with my Android phone (it's on 2.x cm7), works fine though with my tablet on Android 4.x (cm10).
@Riku, I guess you mean that the admin authentication is not working. You're lucky I have the same issue on my device (also 2.3.x cm7) I've had a quick look at it and it looks like the app isn't getting an authentication cookie back in the http response. I've I can find some I'll have an extra look at this problem. I would like to be able to control the simple HM settings by Pitdroid.