Line wrap problem for emacs with ecb

It has hassled me for a long time that when using emacs, some times after some action, the line can't wrap around as usual, and I can't reverse back. Today, I finally decided to solve it. After some tedious commenting out and removing comments in the .emacs file, I noticed that it is ecb which causes the problem. Thus I went to ecb's homepage and read the FAQ. The solution is right there, which says "Check the variable truncate-partial-width-windows and set it to nil". What a relieve it is.