Chat worked during testing, but fails now

Hi - I was testing some chat plugins and I liked WP Chat, but it was one of the first that I tested.

I deactivated and deleted, but now when I re-install it fails to recognize my subscribers.

I have saved the Chat configutation so that all active, registered users from Admin to Subscribers can use it.

I've repeated the deactivation, deletion and re-installation a number of times, and I don't know what to do.

Thanks,

- J