Thanks for your quick response. I run another blog with the same theme (Twenty Ten) with the same plugins (same configuration) and everything is OK!!!!! I don’t understand why those blank lines exist!!!!!!
Yeah I know I need to edit CSS and I tried to do that to change the font size of the body element but actually changes didn’t apply (I don’t use any caching plugins or anything alike.)
I think a child theme is a good idea, I’m reading about it now. Thanks a lot! 🙂
