Over the years I’ve sent lots of crash logs into Eastgate, many of them involving multi-window presentations. But even though I usually work with multi-window layouts, I’ve had very few crashes in recent months.
Actually, as I look back through the logs, I see that my most-recent crash was in late March, and that was an anomalous situation. (I had put the machine to sleep while it was connected to a high-rez external monitor, and then woke it back up when it was no longer connected. The shift in display confused and crashed several programs, one of which was TB.)
I see that my most recent bona fide crash other than that was in early March, which was about 20 “Backstage”-beta releases ago in the program’s development, and which did indeed involve a real multi-window issue.
My experience is that Eastgate is very good in sleuthing out the crash causes, from the crash logs, and correcting them. So I would encourage you to ship yours in, as you’re doing. I know how crazy-making this is when it happens, even though it doesn’t (in my experience) lead to data loss or corruption. But after reporting mine, I’ve had no window-related issues in 3+ months of daily multi-window use. Good luck!