Pretty simple. While I was building a chase, the desktop crashed twice. The steps I took were...
301 @ Full, Color Palette White, Record Choose, Clear
302 @ Full, Color Palette White, Record Choose, Clear
303 @ Full, Color Palette White, Record Choose, Clear
304 @ Full, Color Palette White, Record Choose, Clear
305 @ Full, Color Palette White, Record Choose, Clear
306 @ Full, Color Palette White, Record Choose, Clear
Crash
Restarted Desktop and continued
307 @ Full, Color Palette White, Record Choose, Clear
308 @ Full, Color Palette White, Record Choose, Clear
309 @ Full, Color Palette White, Record Choose, Clear
310 @ Full, Color Palette White, Record Choose, Clear
Crash
Restarted Desktop and finished the chase.
Never got any message.
I did try to repro this and it did not do it the second time I built a chase. It is possible I went too fast and might have got my finger on an additional key, but not sure.