The chat requires the prototype JavaScript framework from Sam Stephenson >=1.4.0. Make sure that the path in the extension manager is correct. Check whether the script is included in the header of your html source. Please make sure that the library is included only once. Otherwise there could occur errors like 'Too much recursions'.

Prototype.js is not compatible with mootools. So the chat would not work if you load mootools.

Many users chatting can result in high server load. You can avoid this by limiting the number of chat users and by increasing the refresh time. Btw, if you add '&tx_vjchat_pi1[debug]=timer' to the url a debug window appears containing time measurements.

'Real names' won't work with chat commands.

Excessive nesting of formats (bold, underlined, http or url) in a chat message can lead to problems.