The problem with text. I have a drawing in which all text is 1.35 mm between  letters formatted. I tried to manually correct it as 1 mm between letters (tracking) and save it, bet when I open the drawing in a new way this problem still exists - interval between letters is 1.35 mm. Please help me!

Letter spacing can be controlled through one of the MText control codes - see:
http://www.cadforum.cz/cadforum_en/qaID.asp?tip=2832