Been an ecabs user for 7 or 8 years, and it just started to hang up while printing drawings. I'm using the latest version, and it has printed normally in the past. I can't think of any changes to my system that might account for the problem.
I was having this problem too, I found that if I had my arrow length and width set to 0 and 0. The program would hang and have to close. After I set a value to the length and width, no more problems.