I'm curious if anyone else can reproduce this issue.
If you are debugging a script and have the Debugger open and the Data Viewer open and the script is running (e.g., long loop) and you're just watching the beach ball (yes, on a Mac) and you decide you would like to drag the Data Viewer window to a different monitor because I have two monitors... and every time this seems to crash for me.
I'm using OS X 10.12.6 and FMPA 188.8.131.522 on a MacBook Air with 8 Gigs of RAM.
Curious if someone else can reproduce this. Also curious if so, if this is just a Mac problem... so I'm hoping some Windows user out there can confirm.
I plan to report this as a bug if others can confirm the same issue.