Make sure you press the EXIT button at the end of your session.
If you see the following message when trying to enter the club:
You are already logged on using a different computer, please leave the club with the other computer first!
then you were in the club using NeXtGen; closed the web page, but forgot to EXIT. Enter the club with NeXtGen (= press the Play button on our home page) and press EXIT this time.
I keep trying to enter by Java and am told that I cannot because I am already logged on on a different computer.
My computer on bridge club live states that am already logged on on another computer