the messages not appear in chat box?

If you are not able to see your text in an IM session window but all your messages are archived then try the following

firstly, In Internet Explorer make sure you have scripting enabled

Sign Out of yahoo messenger

now Exit Yahoo Messenger

spring open Internet Explorer

hit Tools

select Internet Options

now click on the Security Tab to select it

Under Select a Web Content Zone make sure the Internet icon (world globe) is selected

this will show the Internet Zone

Under Security Level for this Zone click on Custom Level

The Settings window will open, scroll down to the category heading "Scripting"

and select "Enable" for the following

- Active scripting

- Allow paste operations via script

- Scripting of Java applets

click OK, click OK

Launch Yahoo! Messenger, now login again.

if you are still seeing no text....

then try really hard to think what Security applications you have installed, ZoneAlarm, NIS, some AntiVirus suites, anything that deals with "security" regarding controls or blocking actions / access, as Yahoo! needs Scripting enable to function so if some other program is blocking this, or preventing the execution of Yahoo! Messenger wont function correctly. Some applications will also revert or over-ride your IE settings back to what they consider appropriate so your IE settings may look correct but are infact being controlled else where.

Last but not least, check what version of yahoo messenger you have installed...

from within Yahoo! Messenger click Help

click About Yahoo! Messenger

a wee About box pops up telling you what version you have installed

if it doesn't state v8.1.0.239 then do give serious consideration to upgrading

8.1.0.239 (for Windows 98 / 2000 / ME / XP) released 19 January 07

Direct Download Location (yahoo servers):

http://download.yahoo.com/dl/msgr8/us/ymsgr810_239...

examine over your internet determination if you're permitting "Java Script" and the rests about scripting. device > internet determination > stepped forward : scroll down and tick bins about scripting.

you inform your service provider.