Jaimie I know Andre has said the editor needs work, the odd behaviour around typeover of a selection and delete/backspacing of quote lines needs fixing up.
I'm going to completely rewrite the editor, but that is quite some work and I'll will do that after the official release.
In the main time, you can remove these quoted lines with ALT+BACKSPACE.
Or incase you have a full size keyboard with numeric part, the DELETE key also works.
Snit Ah, good to hear the editor is being worked on. I had some other issues but will not report at this time.
Please do report any problem you encounter.