You haven't mentioned your version of AE nor provided exact errors and crash logs, so this is not much use.
It's the up to date version of After Effects. The crash occurs if I disrupt the motion tracker in any way. Its immediate. I don't have logs, and really I've got too high of stacks of projects that I'm working 24/7 on to do Adobe's job.
On a related note, I'm getting really tired of major software companies releasing extremely buggy versions of their products masquerading as final versions. I haven't upgraded yet but I'm hearing horror stories about Windows 10. This is getting really old really fast.
You're using version 13.5.1 of AE, right?
Which motion tracker are you using? The point tracker, mocha, camera tracker, rigid mask tracker, or face tracker?
Does it work properly in CC 2014 (version 13.2)? If so, just to get your stack of work out of the way, do your motion tracking there, save the file, and then open that file in CC 2015 to continue working (or carry on working in CC 2014).
If someone accidentally left the option to remove old versions when they installed CC 2015 on your machine, you can easily install CC 2014 again: How to Find and Install Previous Version of Adobe Apps in CC 2015 | Adobe Customer Care Team
If you want to get the issue fixed, the crash logs would give some more info that might help us forum folk figure out your issue. Working with your Operating System’s Tools
We're working on this bug now, and we intend to have a fix for it in our next update.
As you've indicated, the bug is only triggered if you interrupt the motion tracking rather than let the analysis complete.
It's the motion tracker at issue. Though I haven't tried anything else (because no project has demanded it.) Here's hoping that this issue is resolved in the update that showed up today.
UPDATE: Nope. Crash still happening.
> Here's hoping that this issue is resolved in the update that showed up today.
No. As I said, we're working on the fix now and intend to have the fix in our next update.
I also encounter crashes during the tracking process of Motion Tracker. Either it crashes before tracking is completed OR it crashes if I pause it at any point, with the intent to save the project then resume. But not a cchance, it is crash after crash. HURRY WITH THAT BUG FIX!!!!