Ok, now I understanding your problem. You can resolve it with this procedure:
Open the menu_1024_768.ini file.
Find this: Name=Messages; FLB Sale`s 6 Anzeigen
In this block you see this line: Pos=20,-23,700,70
Now replace the 700 with 385
The result will be this: Pos=20,-23,385,70
This modification restored the original length of the texfield.
Enjoy!
Bye