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I'm not referring to how many use can insert per channel, I mean how many plugin windows can remain visable at the same time. It would seem the number of monitors I use is irrelevant (1x HDMI, 1xVGA). Lets say I use 7 inserts, 1 on each track. 6 were dragged over to the VGA monitor. But clicking one of them in the insert panel of the mixing board causes the 7th plugin window I left on the HDMI monitor to disappear. Its not as if anything isn't working, and I'm not complaining. I just wonder if this is normal?

I was also wondering if at the same time, there is a limit as to how many seperate windows you can have - one for the mixing board, another for the sequence editor, etc. I mention this as I remember a NAMM photo where a DP10 project was spread across at least 3 monitors.

That sounds very familiar...
How do you connect the VGA monitor to your MacMini? I think might be related to it.
If you use something like DisplayLink, that's the culprit right there.
In my case, I had to delete everything related to DisplayLink. It is such a piece of crap!

Having the mixer in the VGA monitor made DP stutter. A QT movie would bring it to its knees. The moment I dragged those windows to the HDMI-connected monitor everything was fine again. Console reported hundreds of errors related to DL. Uninstalling it was a bit of a problem too.

Are you sure it's closing and not just being sent to the background behind your main window? In the plug window mini menu there are two 'float' options. You can set the default to float all plugs or do each one individually. Floating keeps them in the foreground. Check that setting for your disappearing plugs.

Not familiar to me. I've never thought about this, and it seems odd that there would be a limit. Just tried it out, and got to 12 plugin windows showing at once on my old MBP before concluding there is no practical limit.