Here is another behaviour which surprised me and may surprise, annoy or confuse other users. (v2.0.02 compiled for Debian x86-64.)
Any change to the text of the .csd file in the editor causes the file on disk to be written when the Play button is pressed.
Normally (to my way of thinking, at least - not accounting for Web 2.0, Android touchscreen app etc. ways of everything changing and jumping around at the slightest touch), an application will not write a file without an explicit command or acknowledgement from the user.
This behaviour permanently changes the example files, unless the user already knows to save to another file before altering the text and pressing Play.