Being suspicious about SWP6 since earlier issues, I did not try it for a while. I have tried to use 6.0.23 to write a talk. That was just a waste of time. I have loose 3 hours. SWP6 is slow, the undo don't really work, erasing a word, a part of formula, or a line is complicated, the managing of the prompt is awkward, and last but no least, SWP6 collapse many an many times. It is not professional. I think I'll wait for 6.1 before trying it again.