There are known bugs which seem to be unfixable by now:

- Big problems with userlist on big hubs. Be sure to leave the userlist checkbox unchecked when connecting to hubs over 200 users. Firefox is very slow when receiving large amounts of data over ajax connection. Opera has no problems with this, but even there it takes way too much time to re-order and display the userlist with all user information. You may even get disconnected in this process for no reason, so be careful. You have been warned ;)
- Userlist overall is very buggy. Sometimes the nicks are not in the correct order. Use the "Open PM tab for nick:" feature to write a PM to somebody whose nick you know.
- Automatic scrolling and PMs are not working in IE. In addition, you get disconnected for no reason in a minute. Why? Noone knows. The good advice is: do not use IE.
- Opera won't display the content of private messages, again, for no reason. I tried everything but with no luck. The content is there, but won't get rendered. At least it is displayed in an alert box.
- The database may get filled with unnecessary records over time. These records remain there when the user browser does not pick them up (and delete them afterwards). It is recommended to truncate all "mekdc_" tables once in a time when you are sure noone is using the client at that time.