Pope de Flash suggested I dropped my problem in this area, especially to Aquaman...

here it comes:

I use Flash 4.0a (Mac version) and I frequently get a bug (?) in the line space.
In the paragraph properties, margins, indentations and line space were set to 0.
After saving and opening the file, I can see the line space has changed. I have to open the paragraph properties and press the OK button again for the right setting.
Turning snapping on and off doesn't help.
I'm getting tired of doing this again and again!
What am I doing wrong?
Note: The text is not a symbol.