After Effects crashes when you apply scribble effect. If you have multiple masks select "all masks" from the drop down and when you click to check "fill paths sequential" After effects crashes. no warnings it just dissappears.
I am using ae 18.104.22.168
If you're looking to report a bug, I would recommend filing a bug report: Feature Request/Bug Report Form The Adobe AE team relies on those reports to know what's gone wrong. There's an update coming out later this year with lots of bug fixes and I'm sure they'd like to fix this one too.
This is just a user-to-user forum and not an official way to contact Adobe, so the bug report is your best way unless you're also looking for troubleshooting help from us, your fellow users. Out of curiosity, does it behave properly in AE version 13.2.1?