**STOP PRESS** June 2008 – this problem is now solved : )
We have just discovered an issue with the latest Flash player plug-in, which is preventing users from accessing stages. It is something to do with policy file changes in the plug-in, and we are in the process of working out what we need to do in order to avoid any problems.
If you have upgraded to the Flash player version 184.108.40.206, you may find that you can’t access UpStage stages. Reverting to version 220.127.116.11 will solve the problem, and until we work it out at our end, that is what we recommend that you do.
Download the Flash Player plug-in v.18.104.22.168 for Windows at:
Mac: download the Flash Player plug-in v.22.214.171.124 for Mac here (4.7 MB).
Linux: download the Flash Player plug-in v.126.96.36.199 for Linux here (2.9 MB).