Drawtext problem

I use WPDF to draw some text into a PDF

I use the method: DrawText(wPDF.Canvas.Handle, PChar(text), Length(text), rect, format);

Probably it's a simply thing but i can't undestand why if i draw a text where the last character is a symbol, the symbol is drawed in the first position.

For example, if a draw 'Art:' the text drawed is ':Art'
or 'Art@' became '@Art'

I have read the Drawtext delphi help but i can't see nothing related to this thing.

I don't think this probem is related to wpdf ...

thanks for any help

Roberto
Delphi 2007
Windows Vista
WPDF 3.21

i'm having the problem (for the moment) only in my Windows Vista computer. In XP seems to works fine ..

This thing make me mad :)

using DT_NOPREFIX option in DrawText

I guess this is a new thing cause i have never had this problem in the past ...

Roberto