Quote: "If you know what cause this or how i can get rid of indentation bug please tell."
I've encountered the symptoms you describe very rarely - and not at all yet on this W7 laptop which I've had for over a year. The only thing I can suggest is the following:
1. Make a backup copy of the project's .dba files just in case.
2. Open up each .dba file in something like Notepad and copy the code to the clipboard.
3. Paste it back in to the same place and save it.
4. Repeat 2. and 3. for each .dba file in the project (or the ones giving the problem).
5. See if you can now edit the project files in the usual way in DBPro.
If that doesn't work, try copying the code text into the DBPro editor itself or some other variant of the above steps.
The rationale behind this is that it's possible that the .dba file has got corrupted somehow and non-printable characters have somehow got into the file - but these might get ignored or lost when you use another text editor such as Notepad.
Unfortunately, I can't now recall which particular combination of copy and paste did the trick but it was something along the above lines. If I recall correctly, Scraggle posted a similar problem a few years back. If I can find his post I'll give the link in this post.
I doubt W7 has anything to do with this.
Edit
Found the link! Here it is:
http://forum.thegamecreators.com/?m=forum_view&t=107470&b=1&msg=1208335#m1208335
[href=http://forum.thegamecreators.com/?m=forum_view&t=107470&b=1&msg=1208335#m1208335]
Scraggle's weird editor problem[/href]
Edit999 Why has the simple task of inserting links suddenly become impossible.
Took a while to find and not sure how relevant it is but worth a shot.