Excellent, thanks for sending that info! From the looks of it, the Dell XPS 15 from January has a 4k monitor. To confirm, is yours also a touchscreen?
If you’re able to reproduce the issue in all files, then would it be possible for you to create a new file with a simple sample interaction that triggers the same issue? If so then we can take a look at that instead of the current file. If the issue only happens in existing files, then please feel free to send one of those over to firstname.lastname@example.org with a link to this thread so that we can take a look and assist you privately. If you happen to be able to include a video of the reproduction steps from your machine for that same file then that would help to follow along and reproduce the issue on our end.
In the meantime, from our testing it looks like this particular issue does not seem to occur if you edit the interactions in the new interactions editor instead of the interactions pane. To access the interactions editor, you’ll want to ensure that you’ve updated to the latest beta build (3635 as of this writing) and then click the interactions editor icon:
The above icon will open up a dialog similar to the case editor from Axure RP 8. We haven’t been able to reproduce the crashes in that dialog, so hopefully that will help to allow you to avoid the issue for the time being.
In the meantime, we’ll continue investigating the bug on our end. We’ll update this thread if there are updates, but otherwise please keep an eye on the 9 beta release notes thread for updates about released bug fixes. Thanks!