Thai Text Problems In Mirc Chat Client

[katana]

Hi,

I was using MIRC 6.12 on Win ME (English edition), and was able to type and view Thai correctly in the MIRC IRC chat client.

On upgrading to Win XP (English edition) a few days ago, I can't get Thai script to display properly in MIRC. It appears in the text boxes OK, but on sending the message it just appears as ????? (question marks). I can get Thai to display properly in other software, so Thai language support appears to be correctly installed on Win XP.

Has anyone managed to get Thai script to display properly in MIRC/Win XP?

Thanks in advance for any advice help.