Help with this problem of font after upgrading to 3.6.5
 

I have just upgraded my forum from 3.5.3 to 3.6.5 and this wierd error appeared.
The problem is i cant see it my self, i'm using windows vista and ie7. Problem reports come from users who are using IE6 and Windows XP. I remember that someone has posted the same error here but cant find the thread anywhere.
Not sure if this is the problem of style or not because when i set the accessibility in IE's option to Ignore the font style, everything seems to be ok.
I love this style of allan, so please help me. Thank you so much T_T

My forum link is www.xtremevn.com/forum

I'm using the ISO-8859-1 charset, most of ppl here are using UTF-8, is there anyway to convert the database or quickfix for this ?
Update: Firefox, Opera, IE7 are ok, IE6 has problems T_T.

Custom settings in IE probably affect it.

Thank you for replying but all of them said that they didnt change anything in IE6 setting, seems that IE7,FF and Opera got better character encoding automated system ? :(
BTW: I deleted the trebutchet font from the style and it seems to be ok right now.

IE6 defaults to a different encoding system maybe?

I think the problem is those XP PCs dont have trebuchet MS font. I have changed the Forumhome font to tahoma -.-