Check you haven't accidentally changed the in-game configuration options so that nothing anyone says is displayed in the chat window - for instance, you have both your public and private chat set to 'Off'. These can be toggled from the bottom of the game window.
There are two things that can cause this:
Try connecting to a different server. You can find a link to each game's servers on the game's 'More Info' page, just above the 'Description' button. If one of our servers is experiencing technical issues then this will solve the problem for you until we get it fixed.
If this doesn't fix your problem then a firewall on your network may be blocking your connection. Please ask your network administrator or ISP to open ports 43594 and 43595 (for TCP traffic, both Inbound and Outbound) which are used by our games. I'm afraid that there is nothing that we can do to help you with this, as it is a problem with the settings on your connection and not something wrong with our games. If this doesn't fix your problem then our servers may be temporarily offline for maintenance or an update; try waiting an hour and then try again.
If you are running a Windows PC with over 1GB of RAM, a memory conflict can occur. This problem is caused by Java not giving the Jagex game enough memory to work with and can be solved using the following steps (Jagex takes no responsibility for any data lost as a consequence of using this fix):
-Xmx256M(include the minus sign). This should increase the maximum available memory to Java to 256MB. Do not set this number to anything more than half of your maximum RAM otherwise Windows could have problems running.
If you are attempting to play Jagex games on a computer running Windows Vista and Internet Explorer, it may be that Windows is set to run in 'Protected Mode'. This mode does not allow Jagex games to cache locally, therefore they crash. To solve this issue, take the following steps:
Alternatively, use the Mozilla Firefox browser to play our games.
If your computer has more than 2 GB of memory (RAM) and you use Sun Java, you may be experiencing a fault in Sun Java which causes it to incorrectly detect how much memory your computer has. To fix this problem:
If this doesn't apply, please try playing in low detail mode and see if this fixes your problem while in that area. If there is one particular area that always causes a problem, please send in a bug report to let us know.
If this is the first time you've played the game (or just the first time for a while) then we may need to update the game files in your computer's cache. This will cause a short delay when loading the game. If you notice any slow-down while playing, this may be caused by a poor Internet connection or low system specifications - make sure your computer meets our minimum specifications. Try playing on a different server, at a different time of day, from a different computer or using a different internet provider. Also, make sure that no other programs are using your internet connection while playing our games. Make sure you are using the signed game applet. Lastly, if you are using an older version of Windows, make sure your Java JIT (Just In Time) compiler is enabled. In Internet Explorer, select Tools > Internet-Options > Advanced > Microsoft VM.
If you are having problems with the sound in any Jagex games, please ensure that your soundcard has the latest drivers installed. You can do this by checking your soundcard manufacturer's website.
First, make sure your computer is updated with the latest system software updates, using Windows Update (for Windows), System Update (for Mac OS X) or the equivalent program or procedure for your operating system. Consult your operating system documentation for further.
Second, make sure you have the most recent version of your web browser, as well as the latest version of Sun Java.
If problems persist, please contact our technical support team.
You will need to provide us with your system information. If you use Windows, you can find this information by selecting Start > Settings > Control Panel > System. Your system information appears on the 'General' tab. If you use Mac OS X, you can find this information by selecting Apple Menu > About this Mac.
If you use an operating system other than Mac OS X, you will also need to provide us with your Java version. In Windows, you can find this information by selecting Start > Settings > Control Panel > Java. Click the 'About' button to see the information we need.
We will also need to know what browser version you use. To find this, select Help > About in your browser.