First, the bad news: There are two ways you can ensure After Effects CS4 will crash on exit:
1) Boot AE CS4 with an add-on script open in a docked panel.
2) Quit AE CS4 with an add-on script open in a docked panel.
Now, the good news: It’s a relatively benevolent crash; you won’t lose data or take down any other programs as well. Also, it’s fairly easy to work around this bug: Either open your scripts that have user interfaces in undocked (floating) panels, or make sure all scripts (such as Ease and Wizz, or TrackerViz) are closed when you quit – perhaps create a Workspace that has them all closed, and select that before quitting.
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