Sorry, I was in the middle of a project, and quickly scribbled a question in hopes to get some help! Here's a little more about the issue.
I've been using Finale and Pro Tools together with the new ReWire functionality. Finale crashes often when using ReWire and Pro Tools. When using without ReWire enabled, it is fairly stable.
Typically, Finale will crash when I hit "play" to hear my file.
I have tried hitting play (or using spacebar to play the file) while Finale is active. I've tried hitting play while Pro Tools is active. In both cases, Finale will crash at least 2-3 times out of 5. I can use it fine until I try to playback the file.
I am curious about some additional information. Are you using the latest version of Pro Tools (12.7?). Also, what operating system (Mac or Windows) and what version of that operating system are you working on currently? Also, which version of Finale are you using? You can check this by opening the program and choosing Help > About Finale (Windows) or Finale [upper version number] > About Finale (Mac).
It actually sounds like you may be running into a fairly new issue. There is a specific part of the latest version of Pro Tools that conflicts with Finale, specifically a DLL called "CFnd.dll". For more information, and a possible workaround, check out this article: Pro Tools 12/Finale v25 crash (Windows).
Since you are using ReWire, the workaround may not quite work as expected, but give it a try. If it doesn't work out, definitely contact our Customer Success team for some more assistance. You can do so using the Submit a request link at the top of this page.