I was obviously talking about TD, what else would I mean? I don't see a way to save in TD in Engie. I have been tinkering around with SHP and found out that creating a new SHP file I can do anything (change palette, use tools, save in TS then in TD) and the file won't break. Meanwhile using the 3tnk.shp (heavy tank) the SHP file will corrupt if i do anything besides use the Draw tool or replace colors.
Update: I tried again editing 3tnk.shp, but this time i saved in TS first, after using tools etc., and then reopened and saved in TD as a new file 31tnk.shp , also after using tools and i got no issues! I then used tools etc. and saved in 3tnk.shp, tried various things and the file wasn't getting corrupted. This is so weird...I can't trust it.