el_supremo:
I haven't got WinXP any more so I can't try this out but is the info in this link any help?
Is ClearType Enabled On Your Windows XP Desktop?Pete
Well yes I know that disabling cleartype will make the arduino IDE work. However this makes text hard to read. So I do not think this is a proper way to solve this, no other Java app has this bug on winxp (at least that I use).
I now use UECIDE as alternative to arduino IDE. But I would like to use official version too. If somebody would debug this .