[Cin] Reproducible crash with specific files and steps

[Phyllis Smith]

Here are the location of the 2 files and the exact steps to create a
reproducible crash ON MY LAPTOP (so maybe it is me?).  Wondering if Andrea
can reproduce on Arch since he always keeps his system up to date?

Input files at:
  https://streamable.com/ppm3hx
  https://streamable.com/ft4qhb
Exact steps:
1) Startup CinGG from a window using new bcast files like:
CIN_CONFIG=/tmp/bcast1 bin/cin
2) Load file of rainbow colors (from ppm3hx streamable) using strategy
"replace current project". Click off error message.
3) Load file of flowers (from ft4qhb streamable) using strategy "append in
new tracks".
4) Using the Video pulldown, choose "attach effect" and pick the Overlay
effect.
5) Check the Settings pulldown and see that Format is currently at RGBA-8;
switch to RGB-8.
6) Type "q" for quit in the main program window and choose "No".
7) Now run again using the same startup type of:  CIN_CONFIG=/tmp/bcast1
bin/cin
8) Do not do anything else, just use the File pulldown and choose "Load
backup". You can X the Tip window.
9) Using the Settings pulldown, choose Format and switch to RGBA-8.
10) Wait for it -- Boom, it crashes and any time you try to Load backup, it
crashes.
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